---
_id: '59805'
abstract:
- lang: eng
  text: The LLC converter achieves the highest efficiency in resonant operation. Conventionally,
    the input DC-link voltage is controlled to operate the LLC converter at resonance
    for the given operating point. However, the DC-link capacitor voltage shows a
    low-frequency voltage ripple (typically the second harmonic of grid frequency)
    in cascaded converters so that the LLC has to adapt its switching frequency within
    the grid period. Conventionally, the LLC converter operates 50% of the time above
    the resonant frequency of 40 kHz and 50% below resonance. Both operating conditions
    cause additional losses. However, experimental measurements indicate that the
    below-resonance operation causes significantly higher losses than above-resonance
    operation due to much higher primary and secondary transformer currents. It is
    better to increase the DC-link voltage by 30% of the peak-to-peak low-frequency
    voltage ripple to mostly avoid below-resonance operation (i.e., from 650 V to
    680 V in this case). With the proposed control, the LLC converter operates about
    75% of time over resonance and only 25% of time below resonance. The overall efficiency
    increases from 97.66% to 97.7% for the average operating point with an 80% load
    current. This corresponds to a 2% total loss reduction. Finally, the peak resonance
    capacitor voltage decreases from 910 V to 790 V (−13%).
article_number: '1517'
author:
- first_name: Roland
  full_name: Unruh, Roland
  id: '34289'
  last_name: Unruh
- first_name: Joachim
  full_name: Böcker, Joachim
  id: '66'
  last_name: Böcker
  orcid: 0000-0002-8480-7295
- first_name: Frank
  full_name: Schafmeister, Frank
  id: '71291'
  last_name: Schafmeister
citation:
  ama: Unruh R, Böcker J, Schafmeister F. Adaptive DC-Link Voltage Control for 22
    kW, 40 kHz LLC Resonant Converter Considering Low-Frequency Voltage Ripple. <i>Electronics</i>.
    2025;14(8). doi:<a href="https://doi.org/10.3390/electronics14081517">10.3390/electronics14081517</a>
  apa: Unruh, R., Böcker, J., &#38; Schafmeister, F. (2025). Adaptive DC-Link Voltage
    Control for 22 kW, 40 kHz LLC Resonant Converter Considering Low-Frequency Voltage
    Ripple. <i>Electronics</i>, <i>14</i>(8), Article 1517. <a href="https://doi.org/10.3390/electronics14081517">https://doi.org/10.3390/electronics14081517</a>
  bibtex: '@article{Unruh_Böcker_Schafmeister_2025, title={Adaptive DC-Link Voltage
    Control for 22 kW, 40 kHz LLC Resonant Converter Considering Low-Frequency Voltage
    Ripple}, volume={14}, DOI={<a href="https://doi.org/10.3390/electronics14081517">10.3390/electronics14081517</a>},
    number={81517}, journal={Electronics}, publisher={MDPI AG}, author={Unruh, Roland
    and Böcker, Joachim and Schafmeister, Frank}, year={2025} }'
  chicago: Unruh, Roland, Joachim Böcker, and Frank Schafmeister. “Adaptive DC-Link
    Voltage Control for 22 KW, 40 KHz LLC Resonant Converter Considering Low-Frequency
    Voltage Ripple.” <i>Electronics</i> 14, no. 8 (2025). <a href="https://doi.org/10.3390/electronics14081517">https://doi.org/10.3390/electronics14081517</a>.
  ieee: 'R. Unruh, J. Böcker, and F. Schafmeister, “Adaptive DC-Link Voltage Control
    for 22 kW, 40 kHz LLC Resonant Converter Considering Low-Frequency Voltage Ripple,”
    <i>Electronics</i>, vol. 14, no. 8, Art. no. 1517, 2025, doi: <a href="https://doi.org/10.3390/electronics14081517">10.3390/electronics14081517</a>.'
  mla: Unruh, Roland, et al. “Adaptive DC-Link Voltage Control for 22 KW, 40 KHz LLC
    Resonant Converter Considering Low-Frequency Voltage Ripple.” <i>Electronics</i>,
    vol. 14, no. 8, 1517, MDPI AG, 2025, doi:<a href="https://doi.org/10.3390/electronics14081517">10.3390/electronics14081517</a>.
  short: R. Unruh, J. Böcker, F. Schafmeister, Electronics 14 (2025).
date_created: 2025-05-05T12:27:39Z
date_updated: 2025-05-05T12:34:00Z
department:
- _id: '52'
doi: 10.3390/electronics14081517
intvolume: '        14'
issue: '8'
keyword:
- adaptive DC-link voltage
- cascaded H-bridge
- resonant operation
- Full-Bridge Converter
- loss minimization
- LLC Resonant Converter
- peak capacitor voltage reduction
language:
- iso: eng
main_file_link:
- url: https://www.mdpi.com/2079-9292/14/8/1517
publication: Electronics
publication_identifier:
  issn:
  - 2079-9292
publication_status: published
publisher: MDPI AG
status: public
title: Adaptive DC-Link Voltage Control for 22 kW, 40 kHz LLC Resonant Converter Considering
  Low-Frequency Voltage Ripple
type: journal_article
user_id: '34289'
volume: 14
year: '2025'
...
---
_id: '59999'
author:
- first_name: Frederik
  full_name: Rautenberg, Frederik
  id: '72602'
  last_name: Rautenberg
- first_name: Michael
  full_name: Kuhlmann, Michael
  id: '49871'
  last_name: Kuhlmann
- first_name: Fritz
  full_name: Seebauer, Fritz
  last_name: Seebauer
- first_name: Jana
  full_name: Wiechmann, Jana
  last_name: Wiechmann
- first_name: Petra
  full_name: Wagner, Petra
  last_name: Wagner
- first_name: Reinhold
  full_name: Haeb-Umbach, Reinhold
  id: '242'
  last_name: Haeb-Umbach
citation:
  ama: 'Rautenberg F, Kuhlmann M, Seebauer F, Wiechmann J, Wagner P, Haeb-Umbach R.
    Speech Synthesis along Perceptual Voice Quality Dimensions. In: <i>ICASSP 2025
    - 2025 IEEE International Conference on Acoustics, Speech and Signal Processing
    (ICASSP)</i>. IEEE; 2025. doi:<a href="https://doi.org/10.1109/icassp49660.2025.10888012">10.1109/icassp49660.2025.10888012</a>'
  apa: Rautenberg, F., Kuhlmann, M., Seebauer, F., Wiechmann, J., Wagner, P., &#38;
    Haeb-Umbach, R. (2025). Speech Synthesis along Perceptual Voice Quality Dimensions.
    <i>ICASSP 2025 - 2025 IEEE International Conference on Acoustics, Speech and Signal
    Processing (ICASSP)</i>. IEEE International Conference on Acoustics, Speech and
    Signal Processing (ICASSP), Hyderabad, India . <a href="https://doi.org/10.1109/icassp49660.2025.10888012">https://doi.org/10.1109/icassp49660.2025.10888012</a>
  bibtex: '@inproceedings{Rautenberg_Kuhlmann_Seebauer_Wiechmann_Wagner_Haeb-Umbach_2025,
    title={Speech Synthesis along Perceptual Voice Quality Dimensions}, DOI={<a href="https://doi.org/10.1109/icassp49660.2025.10888012">10.1109/icassp49660.2025.10888012</a>},
    booktitle={ICASSP 2025 - 2025 IEEE International Conference on Acoustics, Speech
    and Signal Processing (ICASSP)}, publisher={IEEE}, author={Rautenberg, Frederik
    and Kuhlmann, Michael and Seebauer, Fritz and Wiechmann, Jana and Wagner, Petra
    and Haeb-Umbach, Reinhold}, year={2025} }'
  chicago: Rautenberg, Frederik, Michael Kuhlmann, Fritz Seebauer, Jana Wiechmann,
    Petra Wagner, and Reinhold Haeb-Umbach. “Speech Synthesis along Perceptual Voice
    Quality Dimensions.” In <i>ICASSP 2025 - 2025 IEEE International Conference on
    Acoustics, Speech and Signal Processing (ICASSP)</i>. IEEE, 2025. <a href="https://doi.org/10.1109/icassp49660.2025.10888012">https://doi.org/10.1109/icassp49660.2025.10888012</a>.
  ieee: 'F. Rautenberg, M. Kuhlmann, F. Seebauer, J. Wiechmann, P. Wagner, and R.
    Haeb-Umbach, “Speech Synthesis along Perceptual Voice Quality Dimensions,” presented
    at the IEEE International Conference on Acoustics, Speech and Signal Processing
    (ICASSP), Hyderabad, India , 2025, doi: <a href="https://doi.org/10.1109/icassp49660.2025.10888012">10.1109/icassp49660.2025.10888012</a>.'
  mla: Rautenberg, Frederik, et al. “Speech Synthesis along Perceptual Voice Quality
    Dimensions.” <i>ICASSP 2025 - 2025 IEEE International Conference on Acoustics,
    Speech and Signal Processing (ICASSP)</i>, IEEE, 2025, doi:<a href="https://doi.org/10.1109/icassp49660.2025.10888012">10.1109/icassp49660.2025.10888012</a>.
  short: 'F. Rautenberg, M. Kuhlmann, F. Seebauer, J. Wiechmann, P. Wagner, R. Haeb-Umbach,
    in: ICASSP 2025 - 2025 IEEE International Conference on Acoustics, Speech and
    Signal Processing (ICASSP), IEEE, 2025.'
conference:
  end_date: 2025-04-11
  location: 'Hyderabad, India '
  name: IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
  start_date: 2025-04-06
date_created: 2025-05-20T08:17:22Z
date_updated: 2025-05-26T11:09:56Z
department:
- _id: '54'
- _id: '660'
doi: 10.1109/icassp49660.2025.10888012
language:
- iso: eng
project:
- _id: '129'
  grant_number: '438445824'
  name: 'TRR 318 - C06: TRR 318 - Technisch unterstütztes Erklären von Stimmcharakteristika
    (Teilprojekt C06)'
publication: ICASSP 2025 - 2025 IEEE International Conference on Acoustics, Speech
  and Signal Processing (ICASSP)
publication_status: published
publisher: IEEE
status: public
title: Speech Synthesis along Perceptual Voice Quality Dimensions
type: conference
user_id: '72602'
year: '2025'
...
---
_id: '59531'
article_number: '123073'
author:
- first_name: Mehdi
  full_name: Ahmadi, Mehdi
  id: '98967'
  last_name: Ahmadi
- first_name: Lukas
  full_name: Knorr, Lukas
  id: '90391'
  last_name: Knorr
- first_name: Henning
  full_name: Meschede, Henning
  id: '86954'
  last_name: Meschede
  orcid: 0000-0002-1538-089X
citation:
  ama: Ahmadi M, Knorr L, Meschede H. Improvement of Wind Power Utilization Through
    Flexible Operation of Data Center in Wind Parks. <i>Renewable Energy</i>. Published
    online 2025. doi:<a href="https://doi.org/10.1016/j.renene.2025.123073">10.1016/j.renene.2025.123073</a>
  apa: Ahmadi, M., Knorr, L., &#38; Meschede, H. (2025). Improvement of Wind Power
    Utilization Through Flexible Operation of Data Center in Wind Parks. <i>Renewable
    Energy</i>, Article 123073. <a href="https://doi.org/10.1016/j.renene.2025.123073">https://doi.org/10.1016/j.renene.2025.123073</a>
  bibtex: '@article{Ahmadi_Knorr_Meschede_2025, title={Improvement of Wind Power Utilization
    Through Flexible Operation of Data Center in Wind Parks}, DOI={<a href="https://doi.org/10.1016/j.renene.2025.123073">10.1016/j.renene.2025.123073</a>},
    number={123073}, journal={Renewable Energy}, publisher={Elsevier BV}, author={Ahmadi,
    Mehdi and Knorr, Lukas and Meschede, Henning}, year={2025} }'
  chicago: Ahmadi, Mehdi, Lukas Knorr, and Henning Meschede. “Improvement of Wind
    Power Utilization Through Flexible Operation of Data Center in Wind Parks.” <i>Renewable
    Energy</i>, 2025. <a href="https://doi.org/10.1016/j.renene.2025.123073">https://doi.org/10.1016/j.renene.2025.123073</a>.
  ieee: 'M. Ahmadi, L. Knorr, and H. Meschede, “Improvement of Wind Power Utilization
    Through Flexible Operation of Data Center in Wind Parks,” <i>Renewable Energy</i>,
    Art. no. 123073, 2025, doi: <a href="https://doi.org/10.1016/j.renene.2025.123073">10.1016/j.renene.2025.123073</a>.'
  mla: Ahmadi, Mehdi, et al. “Improvement of Wind Power Utilization Through Flexible
    Operation of Data Center in Wind Parks.” <i>Renewable Energy</i>, 123073, Elsevier
    BV, 2025, doi:<a href="https://doi.org/10.1016/j.renene.2025.123073">10.1016/j.renene.2025.123073</a>.
  short: M. Ahmadi, L. Knorr, H. Meschede, Renewable Energy (2025).
date_created: 2025-04-11T23:27:51Z
date_updated: 2025-05-26T11:11:21Z
department:
- _id: '644'
doi: 10.1016/j.renene.2025.123073
language:
- iso: eng
publication: Renewable Energy
publication_identifier:
  issn:
  - 0960-1481
publication_status: published
publisher: Elsevier BV
status: public
title: Improvement of Wind Power Utilization Through Flexible Operation of Data Center
  in Wind Parks
type: journal_article
user_id: '90391'
year: '2025'
...
---
_id: '59995'
abstract:
- lang: eng
  text: "<jats:title>Abstract</jats:title>\r\n               <jats:p>Ultrasonic transmission
    measurements can be used for material characterization, as the propagation time
    of sound waves and thus their velocity depends on the elastic material parameters.
    Measurement results for the elastic material parameters are acquired non-destructively
    using ultrasonic transmission measurements of hollow cylindrical polymer specimens.
    To determine the material parameters, an inverse approach is used comparing measurements
    with simulated data. Previous studies show that the procedure exhibits low sensitivity
    with respect to the shear parameters of the material. In order to increase the
    sensitivity, we propose to apply a spatially annular excitation on the base of
    the specimen. As a measure to analyse the sensitivities with respect to all parameters
    and their linear independence, we observe the volume of the parallelotope of the
    sensitivity vectors. Here, a scaled boundary finite element formulation of wave
    propagation in the specimen is expanded to yield derivative information directly,
    and a sensitivity analysis can be carried out efficiently. Finally, the results
    of this sensitivity analysis with regard to the annular excitation are also applied
    to the measurement setup.</jats:p>"
article_number: '6'
article_type: original
author:
- first_name: Dmitrij
  full_name: Dreiling, Dmitrij
  id: '32616'
  last_name: Dreiling
- first_name: Dominik
  full_name: Itner, Dominik
  last_name: Itner
- first_name: Hauke
  full_name: Gravenkamp, Hauke
  last_name: Gravenkamp
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
- first_name: Carolin
  full_name: Birk, Carolin
  last_name: Birk
- first_name: Bernd
  full_name: Henning, Bernd
  id: '213'
  last_name: Henning
citation:
  ama: Dreiling D, Itner D, Gravenkamp H, Claes L, Birk C, Henning B. Increasing the
    sensitivity of ultrasonic transmission measurements for elastic material parameter
    estimation. <i>Measurement Science and Technology</i>. 2025;36. doi:<a href="https://doi.org/10.1088/1361-6501/add9b6">10.1088/1361-6501/add9b6</a>
  apa: Dreiling, D., Itner, D., Gravenkamp, H., Claes, L., Birk, C., &#38; Henning,
    B. (2025). Increasing the sensitivity of ultrasonic transmission measurements
    for elastic material parameter estimation. <i>Measurement Science and Technology</i>,
    <i>36</i>, Article 6. <a href="https://doi.org/10.1088/1361-6501/add9b6">https://doi.org/10.1088/1361-6501/add9b6</a>
  bibtex: '@article{Dreiling_Itner_Gravenkamp_Claes_Birk_Henning_2025, title={Increasing
    the sensitivity of ultrasonic transmission measurements for elastic material parameter
    estimation}, volume={36}, DOI={<a href="https://doi.org/10.1088/1361-6501/add9b6">10.1088/1361-6501/add9b6</a>},
    number={6}, journal={Measurement Science and Technology}, publisher={IOP Publishing},
    author={Dreiling, Dmitrij and Itner, Dominik and Gravenkamp, Hauke and Claes,
    Leander and Birk, Carolin and Henning, Bernd}, year={2025} }'
  chicago: Dreiling, Dmitrij, Dominik Itner, Hauke Gravenkamp, Leander Claes, Carolin
    Birk, and Bernd Henning. “Increasing the Sensitivity of Ultrasonic Transmission
    Measurements for Elastic Material Parameter Estimation.” <i>Measurement Science
    and Technology</i> 36 (2025). <a href="https://doi.org/10.1088/1361-6501/add9b6">https://doi.org/10.1088/1361-6501/add9b6</a>.
  ieee: 'D. Dreiling, D. Itner, H. Gravenkamp, L. Claes, C. Birk, and B. Henning,
    “Increasing the sensitivity of ultrasonic transmission measurements for elastic
    material parameter estimation,” <i>Measurement Science and Technology</i>, vol.
    36, Art. no. 6, 2025, doi: <a href="https://doi.org/10.1088/1361-6501/add9b6">10.1088/1361-6501/add9b6</a>.'
  mla: Dreiling, Dmitrij, et al. “Increasing the Sensitivity of Ultrasonic Transmission
    Measurements for Elastic Material Parameter Estimation.” <i>Measurement Science
    and Technology</i>, vol. 36, 6, IOP Publishing, 2025, doi:<a href="https://doi.org/10.1088/1361-6501/add9b6">10.1088/1361-6501/add9b6</a>.
  short: D. Dreiling, D. Itner, H. Gravenkamp, L. Claes, C. Birk, B. Henning, Measurement
    Science and Technology 36 (2025).
date_created: 2025-05-19T13:30:39Z
date_updated: 2025-05-27T15:03:38Z
department:
- _id: '49'
doi: 10.1088/1361-6501/add9b6
funded_apc: '1'
intvolume: '        36'
keyword:
- Sensitivity analysis
- Ultrasonic transducer
- Guided waves
- Polymers
- Gram determinant
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://iopscience.iop.org/article/10.1088/1361-6501/add9b6
oa: '1'
project:
- _id: '89'
  grant_number: '409779252'
  name: 'VaMP: Vollständige Bestimmung der akustischen Materialparameter von Polymeren'
publication: Measurement Science and Technology
publication_identifier:
  issn:
  - 0957-0233
  - 1361-6501
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
status: public
title: Increasing the sensitivity of ultrasonic transmission measurements for elastic
  material parameter estimation
type: journal_article
user_id: '32616'
volume: 36
year: '2025'
...
---
_id: '60081'
article_number: '119763'
author:
- first_name: Marius
  full_name: Naumann, Marius
  id: '94950'
  last_name: Naumann
- first_name: Moritz
  full_name: Ostermann, Moritz
  id: '44763'
  last_name: Ostermann
  orcid: https://orcid.org/0000-0003-1146-0443
- first_name: Nadja
  full_name: Buchenau, Nadja
  last_name: Buchenau
- first_name: Jannik
  full_name: Oetzel, Jannik
  last_name: Oetzel
- first_name: Florian
  full_name: Schlosser, Florian
  id: '88614'
  last_name: Schlosser
- first_name: Henning
  full_name: Meschede, Henning
  id: '86954'
  last_name: Meschede
  orcid: 0000-0002-1538-089X
- first_name: Thomas
  full_name: Tröster, Thomas
  id: '553'
  last_name: Tröster
citation:
  ama: 'Naumann M, Ostermann M, Buchenau N, et al. Energy efficiency improvement for
    decarbonization in manufacturing industry: A review. <i>Energy Conversion and
    Management</i>. 2025;338. doi:<a href="https://doi.org/10.1016/j.enconman.2025.119763">10.1016/j.enconman.2025.119763</a>'
  apa: 'Naumann, M., Ostermann, M., Buchenau, N., Oetzel, J., Schlosser, F., Meschede,
    H., &#38; Tröster, T. (2025). Energy efficiency improvement for decarbonization
    in manufacturing industry: A review. <i>Energy Conversion and Management</i>,
    <i>338</i>, Article 119763. <a href="https://doi.org/10.1016/j.enconman.2025.119763">https://doi.org/10.1016/j.enconman.2025.119763</a>'
  bibtex: '@article{Naumann_Ostermann_Buchenau_Oetzel_Schlosser_Meschede_Tröster_2025,
    title={Energy efficiency improvement for decarbonization in manufacturing industry:
    A review}, volume={338}, DOI={<a href="https://doi.org/10.1016/j.enconman.2025.119763">10.1016/j.enconman.2025.119763</a>},
    number={119763}, journal={Energy Conversion and Management}, publisher={Elsevier
    BV}, author={Naumann, Marius and Ostermann, Moritz and Buchenau, Nadja and Oetzel,
    Jannik and Schlosser, Florian and Meschede, Henning and Tröster, Thomas}, year={2025}
    }'
  chicago: 'Naumann, Marius, Moritz Ostermann, Nadja Buchenau, Jannik Oetzel, Florian
    Schlosser, Henning Meschede, and Thomas Tröster. “Energy Efficiency Improvement
    for Decarbonization in Manufacturing Industry: A Review.” <i>Energy Conversion
    and Management</i> 338 (2025). <a href="https://doi.org/10.1016/j.enconman.2025.119763">https://doi.org/10.1016/j.enconman.2025.119763</a>.'
  ieee: 'M. Naumann <i>et al.</i>, “Energy efficiency improvement for decarbonization
    in manufacturing industry: A review,” <i>Energy Conversion and Management</i>,
    vol. 338, Art. no. 119763, 2025, doi: <a href="https://doi.org/10.1016/j.enconman.2025.119763">10.1016/j.enconman.2025.119763</a>.'
  mla: 'Naumann, Marius, et al. “Energy Efficiency Improvement for Decarbonization
    in Manufacturing Industry: A Review.” <i>Energy Conversion and Management</i>,
    vol. 338, 119763, Elsevier BV, 2025, doi:<a href="https://doi.org/10.1016/j.enconman.2025.119763">10.1016/j.enconman.2025.119763</a>.'
  short: M. Naumann, M. Ostermann, N. Buchenau, J. Oetzel, F. Schlosser, H. Meschede,
    T. Tröster, Energy Conversion and Management 338 (2025).
date_created: 2025-05-31T15:23:52Z
date_updated: 2025-06-06T07:49:35Z
department:
- _id: '644'
- _id: '9'
- _id: '149'
- _id: '321'
doi: 10.1016/j.enconman.2025.119763
intvolume: '       338'
language:
- iso: eng
publication: Energy Conversion and Management
publication_identifier:
  issn:
  - 0196-8904
publication_status: published
publisher: Elsevier BV
status: public
title: 'Energy efficiency improvement for decarbonization in manufacturing industry:
  A review'
type: journal_article
user_id: '15952'
volume: 338
year: '2025'
...
---
_id: '62300'
author:
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
- first_name: Jonas
  full_name: Hölscher, Jonas
  id: '73952'
  last_name: Hölscher
- first_name: Olga
  full_name: Friesen, Olga
  id: '44026'
  last_name: Friesen
- first_name: Claus
  full_name: Scheidemann, Claus
  id: '38259'
  last_name: Scheidemann
- first_name: Tobias
  full_name: Hemsel, Tobias
  id: '210'
  last_name: Hemsel
- first_name: Bernd
  full_name: Henning, Bernd
  id: '213'
  last_name: Henning
citation:
  ama: 'Claes L, Hölscher J, Friesen O, Scheidemann C, Hemsel T, Henning B. Estimation
    of third order elastic constants of piezoceramics using DC biased impedance measurements.
    In: <i>2025 International Congress on Ultrasonics</i>. AMA Service GmbH; 2025:142–145.
    doi:<a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">10.5162/ultrasonic2025/a18-a6</a>'
  apa: Claes, L., Hölscher, J., Friesen, O., Scheidemann, C., Hemsel, T., &#38; Henning,
    B. (2025). Estimation of third order elastic constants of piezoceramics using
    DC biased impedance measurements. <i>2025 International Congress on Ultrasonics</i>,
    142–145. <a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">https://doi.org/10.5162/ultrasonic2025/a18-a6</a>
  bibtex: '@inproceedings{Claes_Hölscher_Friesen_Scheidemann_Hemsel_Henning_2025,
    place={Paderborn}, title={Estimation of third order elastic constants of piezoceramics
    using DC biased impedance measurements}, DOI={<a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">10.5162/ultrasonic2025/a18-a6</a>},
    booktitle={2025 International Congress on Ultrasonics}, publisher={AMA Service
    GmbH}, author={Claes, Leander and Hölscher, Jonas and Friesen, Olga and Scheidemann,
    Claus and Hemsel, Tobias and Henning, Bernd}, year={2025}, pages={142–145} }'
  chicago: 'Claes, Leander, Jonas Hölscher, Olga Friesen, Claus Scheidemann, Tobias
    Hemsel, and Bernd Henning. “Estimation of Third Order Elastic Constants of Piezoceramics
    Using DC Biased Impedance Measurements.” In <i>2025 International Congress on
    Ultrasonics</i>, 142–145. Paderborn: AMA Service GmbH, 2025. <a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">https://doi.org/10.5162/ultrasonic2025/a18-a6</a>.'
  ieee: 'L. Claes, J. Hölscher, O. Friesen, C. Scheidemann, T. Hemsel, and B. Henning,
    “Estimation of third order elastic constants of piezoceramics using DC biased
    impedance measurements,” in <i>2025 International Congress on Ultrasonics</i>,
    2025, pp. 142–145, doi: <a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">10.5162/ultrasonic2025/a18-a6</a>.'
  mla: Claes, Leander, et al. “Estimation of Third Order Elastic Constants of Piezoceramics
    Using DC Biased Impedance Measurements.” <i>2025 International Congress on Ultrasonics</i>,
    AMA Service GmbH, 2025, pp. 142–145, doi:<a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">10.5162/ultrasonic2025/a18-a6</a>.
  short: 'L. Claes, J. Hölscher, O. Friesen, C. Scheidemann, T. Hemsel, B. Henning,
    in: 2025 International Congress on Ultrasonics, AMA Service GmbH, Paderborn, 2025,
    pp. 142–145.'
date_created: 2025-11-25T12:23:06Z
date_updated: 2026-01-13T13:00:31Z
department:
- _id: '49'
doi: 10.5162/ultrasonic2025/a18-a6
language:
- iso: eng
page: 142–145
place: Paderborn
project:
- _id: '245'
  name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken
    für Leistungsschallanwendungen (NEPTUN)'
publication: 2025 International Congress on Ultrasonics
publisher: AMA Service GmbH
status: public
title: Estimation of third order elastic constants of piezoceramics using DC biased
  impedance measurements
type: conference
user_id: '11829'
year: '2025'
...
---
_id: '62296'
author:
- first_name: Carsten
  full_name: Spieker, Carsten
  id: '67587'
  last_name: Spieker
- first_name: Jens
  full_name: Förstner, Jens
  id: '158'
  last_name: Förstner
  orcid: 0000-0001-7059-9862
- first_name: Jonas
  full_name: Hölscher, Jonas
  id: '73952'
  last_name: Hölscher
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
- first_name: Bernd
  full_name: Henning, Bernd
  id: '213'
  last_name: Henning
citation:
  ama: 'Spieker C, Förstner J, Hölscher J, Claes L, Henning B. Modeling and simulation
    of the behavior of piezoceramics with the discontinuous Galerkin method. In: <i>2025
    International Congress on Ultrasonics</i>. AMA Service GmbH; 2025:126–129. doi:<a
    href="https://doi.org/10.5162/ultrasonic2025/a18-a1">10.5162/ultrasonic2025/a18-a1</a>'
  apa: Spieker, C., Förstner, J., Hölscher, J., Claes, L., &#38; Henning, B. (2025).
    Modeling and simulation of the behavior of piezoceramics with the discontinuous
    Galerkin method. <i>2025 International Congress on Ultrasonics</i>, 126–129. <a
    href="https://doi.org/10.5162/ultrasonic2025/a18-a1">https://doi.org/10.5162/ultrasonic2025/a18-a1</a>
  bibtex: '@inproceedings{Spieker_Förstner_Hölscher_Claes_Henning_2025, place={Paderborn},
    title={Modeling and simulation of the behavior of piezoceramics with the discontinuous
    Galerkin method}, DOI={<a href="https://doi.org/10.5162/ultrasonic2025/a18-a1">10.5162/ultrasonic2025/a18-a1</a>},
    booktitle={2025 International Congress on Ultrasonics}, publisher={AMA Service
    GmbH}, author={Spieker, Carsten and Förstner, Jens and Hölscher, Jonas and Claes,
    Leander and Henning, Bernd}, year={2025}, pages={126–129} }'
  chicago: 'Spieker, Carsten, Jens Förstner, Jonas Hölscher, Leander Claes, and Bernd
    Henning. “Modeling and Simulation of the Behavior of Piezoceramics with the Discontinuous
    Galerkin Method.” In <i>2025 International Congress on Ultrasonics</i>, 126–129.
    Paderborn: AMA Service GmbH, 2025. <a href="https://doi.org/10.5162/ultrasonic2025/a18-a1">https://doi.org/10.5162/ultrasonic2025/a18-a1</a>.'
  ieee: 'C. Spieker, J. Förstner, J. Hölscher, L. Claes, and B. Henning, “Modeling
    and simulation of the behavior of piezoceramics with the discontinuous Galerkin
    method,” in <i>2025 International Congress on Ultrasonics</i>, 2025, pp. 126–129,
    doi: <a href="https://doi.org/10.5162/ultrasonic2025/a18-a1">10.5162/ultrasonic2025/a18-a1</a>.'
  mla: Spieker, Carsten, et al. “Modeling and Simulation of the Behavior of Piezoceramics
    with the Discontinuous Galerkin Method.” <i>2025 International Congress on Ultrasonics</i>,
    AMA Service GmbH, 2025, pp. 126–129, doi:<a href="https://doi.org/10.5162/ultrasonic2025/a18-a1">10.5162/ultrasonic2025/a18-a1</a>.
  short: 'C. Spieker, J. Förstner, J. Hölscher, L. Claes, B. Henning, in: 2025 International
    Congress on Ultrasonics, AMA Service GmbH, Paderborn, 2025, pp. 126–129.'
date_created: 2025-11-25T12:23:05Z
date_updated: 2026-01-13T13:00:25Z
department:
- _id: '49'
- _id: '61'
doi: 10.5162/ultrasonic2025/a18-a1
language:
- iso: eng
page: 126–129
place: Paderborn
project:
- _id: '245'
  name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken
    für Leistungsschallanwendungen (NEPTUN)'
publication: 2025 International Congress on Ultrasonics
publisher: AMA Service GmbH
status: public
title: Modeling and simulation of the behavior of piezoceramics with the discontinuous
  Galerkin method
type: conference
user_id: '11829'
year: '2025'
...
---
_id: '62297'
author:
- first_name: Jonas
  full_name: Hölscher, Jonas
  id: '73952'
  last_name: Hölscher
- first_name: Olga
  full_name: Friesen, Olga
  id: '44026'
  last_name: Friesen
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
- first_name: Carsten
  full_name: Spieker, Carsten
  id: '67587'
  last_name: Spieker
- first_name: Jens
  full_name: Förstner, Jens
  id: '158'
  last_name: Förstner
  orcid: 0000-0001-7059-9862
- first_name: Bernd
  full_name: Henning, Bernd
  id: '213'
  last_name: Henning
citation:
  ama: 'Hölscher J, Friesen O, Claes L, Spieker C, Förstner J, Henning B. Multiscale
    thermo-piezoelectric simulations using the finite element method. In: <i>2025
    International Congress on Ultrasonics</i>. AMA Service GmbH; 2025:130–133. doi:<a
    href="https://doi.org/10.5162/ultrasonic2025/a18-a2">10.5162/ultrasonic2025/a18-a2</a>'
  apa: Hölscher, J., Friesen, O., Claes, L., Spieker, C., Förstner, J., &#38; Henning,
    B. (2025). Multiscale thermo-piezoelectric simulations using the finite element
    method. <i>2025 International Congress on Ultrasonics</i>, 130–133. <a href="https://doi.org/10.5162/ultrasonic2025/a18-a2">https://doi.org/10.5162/ultrasonic2025/a18-a2</a>
  bibtex: '@inproceedings{Hölscher_Friesen_Claes_Spieker_Förstner_Henning_2025, place={Paderborn},
    title={Multiscale thermo-piezoelectric simulations using the finite element method},
    DOI={<a href="https://doi.org/10.5162/ultrasonic2025/a18-a2">10.5162/ultrasonic2025/a18-a2</a>},
    booktitle={2025 International Congress on Ultrasonics}, publisher={AMA Service
    GmbH}, author={Hölscher, Jonas and Friesen, Olga and Claes, Leander and Spieker,
    Carsten and Förstner, Jens and Henning, Bernd}, year={2025}, pages={130–133} }'
  chicago: 'Hölscher, Jonas, Olga Friesen, Leander Claes, Carsten Spieker, Jens Förstner,
    and Bernd Henning. “Multiscale Thermo-Piezoelectric Simulations Using the Finite
    Element Method.” In <i>2025 International Congress on Ultrasonics</i>, 130–133.
    Paderborn: AMA Service GmbH, 2025. <a href="https://doi.org/10.5162/ultrasonic2025/a18-a2">https://doi.org/10.5162/ultrasonic2025/a18-a2</a>.'
  ieee: 'J. Hölscher, O. Friesen, L. Claes, C. Spieker, J. Förstner, and B. Henning,
    “Multiscale thermo-piezoelectric simulations using the finite element method,”
    in <i>2025 International Congress on Ultrasonics</i>, 2025, pp. 130–133, doi:
    <a href="https://doi.org/10.5162/ultrasonic2025/a18-a2">10.5162/ultrasonic2025/a18-a2</a>.'
  mla: Hölscher, Jonas, et al. “Multiscale Thermo-Piezoelectric Simulations Using
    the Finite Element Method.” <i>2025 International Congress on Ultrasonics</i>,
    AMA Service GmbH, 2025, pp. 130–133, doi:<a href="https://doi.org/10.5162/ultrasonic2025/a18-a2">10.5162/ultrasonic2025/a18-a2</a>.
  short: 'J. Hölscher, O. Friesen, L. Claes, C. Spieker, J. Förstner, B. Henning,
    in: 2025 International Congress on Ultrasonics, AMA Service GmbH, Paderborn, 2025,
    pp. 130–133.'
date_created: 2025-11-25T12:23:06Z
date_updated: 2026-01-13T12:59:56Z
department:
- _id: '49'
- _id: '61'
doi: 10.5162/ultrasonic2025/a18-a2
language:
- iso: eng
page: 130–133
place: Paderborn
project:
- _id: '245'
  name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken
    für Leistungsschallanwendungen (NEPTUN)'
publication: 2025 International Congress on Ultrasonics
publisher: AMA Service GmbH
status: public
title: Multiscale thermo-piezoelectric simulations using the finite element method
type: conference
user_id: '11829'
year: '2025'
...
---
_id: '63440'
author:
- first_name: Elmar
  full_name: Moritzer, Elmar
  id: '20531'
  last_name: Moritzer
- first_name: Philipp
  full_name: Brandes, Philipp
  id: '70091'
  last_name: Brandes
  orcid: 0009-0005-9707-0885
- first_name: Max Siegfried
  full_name: Westphal, Max Siegfried
  last_name: Westphal
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
- first_name: Mareen
  full_name: Wippermann, Mareen
  id: '74624'
  last_name: Wippermann
- first_name: Julia
  full_name: Düchting, Julia
  last_name: Düchting
- first_name: Bernd
  full_name: Henning, Bernd
  id: '213'
  last_name: Henning
citation:
  ama: Moritzer E, Brandes P, Westphal MS, et al. ZERSTÖRUNGSFREIE ULTRASCHALLPRÜFUNG
    VON ORGANOBLECHEN. <i>WAK Jahresmagazin</i>. 2025;2025:26–29.
  apa: Moritzer, E., Brandes, P., Westphal, M. S., Claes, L., Wippermann, M., Düchting,
    J., &#38; Henning, B. (2025). ZERSTÖRUNGSFREIE ULTRASCHALLPRÜFUNG VON ORGANOBLECHEN.
    <i>WAK Jahresmagazin</i>, <i>2025</i>, 26–29.
  bibtex: '@article{Moritzer_Brandes_Westphal_Claes_Wippermann_Düchting_Henning_2025,
    title={ZERSTÖRUNGSFREIE ULTRASCHALLPRÜFUNG VON ORGANOBLECHEN}, volume={2025},
    journal={WAK Jahresmagazin}, author={Moritzer, Elmar and Brandes, Philipp and
    Westphal, Max Siegfried and Claes, Leander and Wippermann, Mareen and Düchting,
    Julia and Henning, Bernd}, year={2025}, pages={26–29} }'
  chicago: 'Moritzer, Elmar, Philipp Brandes, Max Siegfried Westphal, Leander Claes,
    Mareen Wippermann, Julia Düchting, and Bernd Henning. “ZERSTÖRUNGSFREIE ULTRASCHALLPRÜFUNG
    VON ORGANOBLECHEN.” <i>WAK Jahresmagazin</i> 2025 (2025): 26–29.'
  ieee: E. Moritzer <i>et al.</i>, “ZERSTÖRUNGSFREIE ULTRASCHALLPRÜFUNG VON ORGANOBLECHEN,”
    <i>WAK Jahresmagazin</i>, vol. 2025, pp. 26–29, 2025.
  mla: Moritzer, Elmar, et al. “ZERSTÖRUNGSFREIE ULTRASCHALLPRÜFUNG VON ORGANOBLECHEN.”
    <i>WAK Jahresmagazin</i>, vol. 2025, 2025, pp. 26–29.
  short: E. Moritzer, P. Brandes, M.S. Westphal, L. Claes, M. Wippermann, J. Düchting,
    B. Henning, WAK Jahresmagazin 2025 (2025) 26–29.
date_created: 2026-01-05T08:42:55Z
date_updated: 2026-01-14T07:46:06Z
department:
- _id: '9'
- _id: '321'
- _id: '367'
- _id: '49'
intvolume: '      2025'
keyword:
- Faser-Kunststoff-Verbunde (FKV)
- Faserverstärkte Kunststoffe (FVK)
- Organobleche
- Ultraschall
language:
- iso: ger
page: 26–29
project:
- _id: '157'
  grant_number: '495847374'
  name: 'FaMOUS: Ein ultraschallbasiertes Messverfahren unter Berücksichtigung viskoelastischer
    Eigenschaften zur Charakterisierung der Faser-Matrix-Haftung bei Organoblechen
    sowie deren realitätsnahe Modellierung'
publication: WAK Jahresmagazin
status: public
title: ZERSTÖRUNGSFREIE ULTRASCHALLPRÜFUNG VON ORGANOBLECHEN
type: journal_article
user_id: '11829'
volume: 2025
year: '2025'
...
---
_id: '62295'
author:
- first_name: Mareen
  full_name: Wippermann, Mareen
  id: '74624'
  last_name: Wippermann
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
citation:
  ama: 'Wippermann M, Claes L. Phononic crystallography of fibre-reinforced polymers
    using broadband acoustic waves. In: <i>2025 International Congress on Ultrasonics</i>.
    AMA Service GmbH; 2025:24--27. doi:<a href="https://doi.org/10.5162/ultrasonic2025/a1-b2">10.5162/ultrasonic2025/a1-b2</a>'
  apa: Wippermann, M., &#38; Claes, L. (2025). Phononic crystallography of fibre-reinforced
    polymers using broadband acoustic waves. <i>2025 International Congress on Ultrasonics</i>,
    24--27. <a href="https://doi.org/10.5162/ultrasonic2025/a1-b2">https://doi.org/10.5162/ultrasonic2025/a1-b2</a>
  bibtex: '@inproceedings{Wippermann_Claes_2025, place={Paderborn}, title={Phononic
    crystallography of fibre-reinforced polymers using broadband acoustic waves},
    DOI={<a href="https://doi.org/10.5162/ultrasonic2025/a1-b2">10.5162/ultrasonic2025/a1-b2</a>},
    booktitle={2025 International Congress on Ultrasonics}, publisher={AMA Service
    GmbH}, author={Wippermann, Mareen and Claes, Leander}, year={2025}, pages={24--27}
    }'
  chicago: 'Wippermann, Mareen, and Leander Claes. “Phononic Crystallography of Fibre-Reinforced
    Polymers Using Broadband Acoustic Waves.” In <i>2025 International Congress on
    Ultrasonics</i>, 24--27. Paderborn: AMA Service GmbH, 2025. <a href="https://doi.org/10.5162/ultrasonic2025/a1-b2">https://doi.org/10.5162/ultrasonic2025/a1-b2</a>.'
  ieee: 'M. Wippermann and L. Claes, “Phononic crystallography of fibre-reinforced
    polymers using broadband acoustic waves,” in <i>2025 International Congress on
    Ultrasonics</i>, Paderborn, 2025, pp. 24--27, doi: <a href="https://doi.org/10.5162/ultrasonic2025/a1-b2">10.5162/ultrasonic2025/a1-b2</a>.'
  mla: Wippermann, Mareen, and Leander Claes. “Phononic Crystallography of Fibre-Reinforced
    Polymers Using Broadband Acoustic Waves.” <i>2025 International Congress on Ultrasonics</i>,
    AMA Service GmbH, 2025, pp. 24--27, doi:<a href="https://doi.org/10.5162/ultrasonic2025/a1-b2">10.5162/ultrasonic2025/a1-b2</a>.
  short: 'M. Wippermann, L. Claes, in: 2025 International Congress on Ultrasonics,
    AMA Service GmbH, Paderborn, 2025, pp. 24--27.'
conference:
  end_date: 2025-09-25
  location: Paderborn
  name: International Congress on Ultrasonics
  start_date: 2025-09-21
date_created: 2025-11-25T10:23:09Z
date_updated: 2026-02-03T07:27:14Z
department:
- _id: '49'
doi: 10.5162/ultrasonic2025/a1-b2
language:
- iso: eng
page: 24--27
place: Paderborn
project:
- _id: '157'
  grant_number: '495847374'
  name: 'FaMOUS: Ein ultraschallbasiertes Messverfahren unter Berücksichtigung viskoelastischer
    Eigenschaften zur Charakterisierung der Faser-Matrix-Haftung bei Organoblechen
    sowie deren realitätsnahe Modellierung'
publication: 2025 International Congress on Ultrasonics
publication_status: published
publisher: AMA Service GmbH
status: public
title: Phononic crystallography of fibre-reinforced polymers using broadband acoustic
  waves
type: conference
user_id: '11829'
year: '2025'
...
---
_id: '62042'
author:
- first_name: Eileen
  full_name: Reckmann, Eileen
  id: '101166'
  last_name: Reckmann
- first_name: Tobias
  full_name: Blomberg, Tobias
  id: '78354'
  last_name: Blomberg
- first_name: Katrin
  full_name: Temmen, Katrin
  id: '30086'
  last_name: Temmen
citation:
  ama: 'Reckmann E, Blomberg T, Temmen K. Neue Wege für das Schülerlabor – Rahmenbedingungen
    eines mobilen Schülerlabors. In: van Vorst H, ed. <i>Entdecken, lehren und forschen
    im Schülerlabor</i>. Vol 45. Tagungsband 2025. ; 2025.'
  apa: Reckmann, E., Blomberg, T., &#38; Temmen, K. (2025). Neue Wege für das Schülerlabor
    – Rahmenbedingungen eines mobilen Schülerlabors. In H. van Vorst (Ed.), <i>Entdecken,
    lehren und forschen im Schülerlabor</i> (Vol. 45).
  bibtex: '@inproceedings{Reckmann_Blomberg_Temmen_2025, series={Tagungsband 2025},
    title={Neue Wege für das Schülerlabor – Rahmenbedingungen eines mobilen Schülerlabors},
    volume={45}, booktitle={Entdecken, lehren und forschen im Schülerlabor}, author={Reckmann,
    Eileen and Blomberg, Tobias and Temmen, Katrin}, editor={van Vorst, Helena}, year={2025},
    collection={Tagungsband 2025} }'
  chicago: Reckmann, Eileen, Tobias Blomberg, and Katrin Temmen. “Neue Wege für das
    Schülerlabor – Rahmenbedingungen eines mobilen Schülerlabors.” In <i>Entdecken,
    lehren und forschen im Schülerlabor</i>, edited by Helena van Vorst, Vol. 45.
    Tagungsband 2025, 2025.
  ieee: E. Reckmann, T. Blomberg, and K. Temmen, “Neue Wege für das Schülerlabor –
    Rahmenbedingungen eines mobilen Schülerlabors,” in <i>Entdecken, lehren und forschen
    im Schülerlabor</i>, Bochum, 2025, vol. 45.
  mla: Reckmann, Eileen, et al. “Neue Wege für das Schülerlabor – Rahmenbedingungen
    eines mobilen Schülerlabors.” <i>Entdecken, lehren und forschen im Schülerlabor</i>,
    edited by Helena van Vorst, vol. 45, 2025.
  short: 'E. Reckmann, T. Blomberg, K. Temmen, in: H. van Vorst (Ed.), Entdecken,
    lehren und forschen im Schülerlabor, 2025.'
conference:
  end_date: 2024-09-12
  location: Bochum
  name: '51. Jahrestagung der Gesellschaft für Didaktik der Chemie und Physik (GDCP) '
  start_date: 2024-09-09
date_created: 2025-11-03T09:36:57Z
date_updated: 2026-02-04T14:56:58Z
ddc:
- '370'
department:
- _id: '300'
editor:
- first_name: Helena
  full_name: van Vorst, Helena
  last_name: van Vorst
file:
- access_level: open_access
  content_type: application/pdf
  creator: eileen4
  date_created: 2025-11-03T09:36:08Z
  date_updated: 2025-11-03T09:36:08Z
  file_id: '62043'
  file_name: P093_Reckmann.pdf
  file_size: 227331
  relation: main_file
file_date_updated: 2025-11-03T09:36:08Z
has_accepted_license: '1'
intvolume: '        45'
language:
- iso: ger
oa: '1'
publication: Entdecken, lehren und forschen im Schülerlabor
series_title: Tagungsband 2025
status: public
title: Neue Wege für das Schülerlabor – Rahmenbedingungen eines mobilen Schülerlabors
type: conference
user_id: '101166'
volume: 45
year: '2025'
...
---
_id: '64145'
author:
- first_name: Melissa
  full_name: Newberry, Melissa
  last_name: Newberry
- first_name: Gabriela
  full_name: Jonas-Ahrend, Gabriela
  id: '77633'
  last_name: Jonas-Ahrend
  orcid: 0000-0003-3898-954X
- first_name: Meher
  full_name: Rizvi, Meher
  last_name: Rizvi
- first_name: Anna
  full_name: van der Want, Anna
  last_name: van der Want
citation:
  ama: 'Newberry M, Jonas-Ahrend G, Rizvi M, van der Want A. The Dynamics of Geographic
    Space when working with International Teacher Educators in Collaborative Research.
    In: ; 2025.'
  apa: Newberry, M., Jonas-Ahrend, G., Rizvi, M., &#38; van der Want, A. (2025). <i>The
    Dynamics of Geographic Space when working with International Teacher Educators
    in Collaborative Research</i>. ISATT - 21st Biennial Conference of the International
    Study Association on Teachers and Teaching, Glasgow.
  bibtex: '@inproceedings{Newberry_Jonas-Ahrend_Rizvi_van der Want_2025, title={The
    Dynamics of Geographic Space when working with International Teacher Educators
    in Collaborative Research}, author={Newberry, Melissa and Jonas-Ahrend, Gabriela
    and Rizvi, Meher and van der Want, Anna}, year={2025} }'
  chicago: Newberry, Melissa, Gabriela Jonas-Ahrend, Meher Rizvi, and Anna van der
    Want. “The Dynamics of Geographic Space When Working with International Teacher
    Educators in Collaborative Research,” 2025.
  ieee: M. Newberry, G. Jonas-Ahrend, M. Rizvi, and A. van der Want, “The Dynamics
    of Geographic Space when working with International Teacher Educators in Collaborative
    Research,” presented at the ISATT - 21st Biennial Conference of the International
    Study Association on Teachers and Teaching, Glasgow, 2025.
  mla: Newberry, Melissa, et al. <i>The Dynamics of Geographic Space When Working
    with International Teacher Educators in Collaborative Research</i>. 2025.
  short: 'M. Newberry, G. Jonas-Ahrend, M. Rizvi, A. van der Want, in: 2025.'
conference:
  end_date: 2025-07-04
  location: Glasgow
  name: ISATT - 21st Biennial Conference of the International Study Association on
    Teachers and Teaching
  start_date: 2025-06-30
date_created: 2026-02-12T14:28:22Z
date_updated: 2026-02-12T14:28:50Z
department:
- _id: '300'
language:
- iso: eng
status: public
title: The Dynamics of Geographic Space when working with International Teacher Educators
  in Collaborative Research
type: conference_abstract
user_id: '77633'
year: '2025'
...
---
_id: '64143'
author:
- first_name: Ainat
  full_name: Guberman, Ainat
  last_name: Guberman
- first_name: Gabriela
  full_name: Jonas-Ahrend, Gabriela
  id: '77633'
  last_name: Jonas-Ahrend
  orcid: 0000-0003-3898-954X
- first_name: Rinat
  full_name: Arvif-Elyashiv, Rinat
  last_name: Arvif-Elyashiv
- first_name: Gal
  full_name: Ben-Yehduah, Gal
  last_name: Ben-Yehduah
- first_name: Dominik
  full_name: Cyprus, Dominik
  last_name: Cyprus
citation:
  ama: 'Guberman A, Jonas-Ahrend G, Arvif-Elyashiv R, Ben-Yehduah G, Cyprus D. Career
    Changing STEM Teachers` Motivation over Time: Lessons from Israel and Germany.
    In: ; 2025.'
  apa: 'Guberman, A., Jonas-Ahrend, G., Arvif-Elyashiv, R., Ben-Yehduah, G., &#38;
    Cyprus, D. (2025). <i>Career Changing STEM Teachers` Motivation over Time: Lessons
    from Israel and Germany</i>. ECER  European Conference on Educational Research,
    Belgrad.'
  bibtex: '@inproceedings{Guberman_Jonas-Ahrend_Arvif-Elyashiv_Ben-Yehduah_Cyprus_2025,
    title={Career Changing STEM Teachers` Motivation over Time: Lessons from Israel
    and Germany}, author={Guberman, Ainat and Jonas-Ahrend, Gabriela and Arvif-Elyashiv,
    Rinat and Ben-Yehduah, Gal and Cyprus, Dominik}, year={2025} }'
  chicago: 'Guberman, Ainat, Gabriela Jonas-Ahrend, Rinat Arvif-Elyashiv, Gal Ben-Yehduah,
    and Dominik Cyprus. “Career Changing STEM Teachers` Motivation over Time: Lessons
    from Israel and Germany,” 2025.'
  ieee: 'A. Guberman, G. Jonas-Ahrend, R. Arvif-Elyashiv, G. Ben-Yehduah, and D. Cyprus,
    “Career Changing STEM Teachers` Motivation over Time: Lessons from Israel and
    Germany,” presented at the ECER  European Conference on Educational Research,
    Belgrad, 2025.'
  mla: 'Guberman, Ainat, et al. <i>Career Changing STEM Teachers` Motivation over
    Time: Lessons from Israel and Germany</i>. 2025.'
  short: 'A. Guberman, G. Jonas-Ahrend, R. Arvif-Elyashiv, G. Ben-Yehduah, D. Cyprus,
    in: 2025.'
conference:
  end_date: 2025-09-12
  location: Belgrad
  name: ECER  European Conference on Educational Research
  start_date: 2025-09-09
date_created: 2026-02-12T14:24:11Z
date_updated: 2026-02-12T14:28:53Z
department:
- _id: '300'
language:
- iso: eng
status: public
title: 'Career Changing STEM Teachers` Motivation over Time: Lessons from Israel and
  Germany'
type: conference_abstract
user_id: '77633'
year: '2025'
...
---
_id: '64142'
author:
- first_name: Tara
  full_name: Ratnam, Tara
  last_name: Ratnam
- first_name: Gabriela
  full_name: Jonas-Ahrend, Gabriela
  id: '77633'
  last_name: Jonas-Ahrend
  orcid: 0000-0003-3898-954X
- first_name: Melissa
  full_name: Newberry, Melissa
  last_name: Newberry
citation:
  ama: 'Ratnam T, Jonas-Ahrend G, Newberry M. The presence of an Invisible College
    in the knowledge network of ISATT. In: ; 2025.'
  apa: Ratnam, T., Jonas-Ahrend, G., &#38; Newberry, M. (2025). <i>The presence of
    an Invisible College in the knowledge network of ISATT</i>. AERA American Educational
    Research Association, Denver/CO, USA.
  bibtex: '@inproceedings{Ratnam_Jonas-Ahrend_Newberry_2025, title={The presence of
    an Invisible College in the knowledge network of ISATT}, author={Ratnam, Tara
    and Jonas-Ahrend, Gabriela and Newberry, Melissa}, year={2025} }'
  chicago: Ratnam, Tara, Gabriela Jonas-Ahrend, and Melissa Newberry. “The Presence
    of an Invisible College in the Knowledge Network of ISATT,” 2025.
  ieee: T. Ratnam, G. Jonas-Ahrend, and M. Newberry, “The presence of an Invisible
    College in the knowledge network of ISATT,” presented at the AERA American Educational
    Research Association, Denver/CO, USA, 2025.
  mla: Ratnam, Tara, et al. <i>The Presence of an Invisible College in the Knowledge
    Network of ISATT</i>. 2025.
  short: 'T. Ratnam, G. Jonas-Ahrend, M. Newberry, in: 2025.'
conference:
  end_date: 2025-04-27
  location: Denver/CO, USA
  name: AERA American Educational Research Association
  start_date: 2025-04-23
date_created: 2026-02-12T14:19:27Z
date_updated: 2026-02-12T14:28:56Z
department:
- _id: '300'
language:
- iso: eng
status: public
title: The presence of an Invisible College in the knowledge network of ISATT
type: conference_abstract
user_id: '77633'
year: '2025'
...
---
_id: '62188'
author:
- first_name: Mats
  full_name: Vernholz, Mats
  id: '76955'
  last_name: Vernholz
  orcid: 0000-0001-5175-357X
- first_name: Gabriela
  full_name: Jonas-Ahrend, Gabriela
  id: '77633'
  last_name: Jonas-Ahrend
  orcid: 0000-0003-3898-954X
- first_name: Katrin
  full_name: Temmen, Katrin
  id: '30086'
  last_name: Temmen
citation:
  ama: 'Vernholz M, Jonas-Ahrend G, Temmen K. „Und ich sag mal, Theorie und Praxis
    ist zweierlei“. Wie können Praxisphasen Lehramtsstudierende auf zukünftige Anforderungen
    vorbereiten? . In: Wiemer T, Binder M, Penning I, eds. <i>Zukünfte technischer
    Bildung</i>. Vol 26. Jahrestagungen der Deutschen Gesellschaft für Technische
    Bildung e.V. . ; 2025. doi:<a href="https://doi.org/10.25932/publishup-67926">https://doi.org/10.25932/publishup-67926</a>'
  apa: Vernholz, M., Jonas-Ahrend, G., &#38; Temmen, K. (2025). „Und ich sag mal,
    Theorie und Praxis ist zweierlei“. Wie können Praxisphasen Lehramtsstudierende
    auf zukünftige Anforderungen vorbereiten? . In T. Wiemer, M. Binder, &#38; I.
    Penning (Eds.), <i>Zukünfte technischer Bildung</i> (Vol. 26). <a href="https://doi.org/10.25932/publishup-67926">https://doi.org/10.25932/publishup-67926</a>
  bibtex: '@inbook{Vernholz_Jonas-Ahrend_Temmen_2025, place={Universitätsverlag Potsdam},
    series={Jahrestagungen der Deutschen Gesellschaft für Technische Bildung e.V.
    }, title={„Und ich sag mal, Theorie und Praxis ist zweierlei“. Wie können Praxisphasen
    Lehramtsstudierende auf zukünftige Anforderungen vorbereiten? }, volume={26},
    DOI={<a href="https://doi.org/10.25932/publishup-67926">https://doi.org/10.25932/publishup-67926</a>},
    booktitle={Zukünfte technischer Bildung}, author={Vernholz, Mats and Jonas-Ahrend,
    Gabriela and Temmen, Katrin}, editor={Wiemer, Tobias and Binder, Martin and Penning,
    Isabelle}, year={2025}, collection={Jahrestagungen der Deutschen Gesellschaft
    für Technische Bildung e.V. } }'
  chicago: Vernholz, Mats, Gabriela Jonas-Ahrend, and Katrin Temmen. “„Und ich sag
    mal, Theorie und Praxis ist zweierlei“. Wie können Praxisphasen Lehramtsstudierende
    auf zukünftige Anforderungen vorbereiten? .” In <i>Zukünfte technischer Bildung</i>,
    edited by Tobias Wiemer, Martin Binder, and Isabelle Penning, Vol. 26. Jahrestagungen
    der Deutschen Gesellschaft für Technische Bildung e.V. . Universitätsverlag Potsdam,
    2025. <a href="https://doi.org/10.25932/publishup-67926">https://doi.org/10.25932/publishup-67926</a>.
  ieee: M. Vernholz, G. Jonas-Ahrend, and K. Temmen, “„Und ich sag mal, Theorie und
    Praxis ist zweierlei“. Wie können Praxisphasen Lehramtsstudierende auf zukünftige
    Anforderungen vorbereiten? ,” in <i>Zukünfte technischer Bildung</i>, vol. 26,
    T. Wiemer, M. Binder, and I. Penning, Eds. Universitätsverlag Potsdam, 2025.
  mla: Vernholz, Mats, et al. “„Und ich sag mal, Theorie und Praxis ist zweierlei“.
    Wie können Praxisphasen Lehramtsstudierende auf zukünftige Anforderungen vorbereiten?
    .” <i>Zukünfte technischer Bildung</i>, edited by Tobias Wiemer et al., vol. 26,
    2025, doi:<a href="https://doi.org/10.25932/publishup-67926">https://doi.org/10.25932/publishup-67926</a>.
  short: 'M. Vernholz, G. Jonas-Ahrend, K. Temmen, in: T. Wiemer, M. Binder, I. Penning
    (Eds.), Zukünfte technischer Bildung, Universitätsverlag Potsdam, 2025.'
conference:
  end_date: 2024-09-20
  location: Halle/Saale
  name: Deutsche Gesellschaft für Technische Bildung (DGTB)
  start_date: 2024-09-18
date_created: 2025-11-14T10:52:10Z
date_updated: 2026-02-17T07:52:34Z
ddc:
- '370'
department:
- _id: '300'
doi: https://doi.org/10.25932/publishup-67926
editor:
- first_name: Tobias
  full_name: Wiemer, Tobias
  last_name: Wiemer
- first_name: Martin
  full_name: Binder, Martin
  last_name: Binder
- first_name: Isabelle
  full_name: Penning, Isabelle
  last_name: Penning
file:
- access_level: closed
  content_type: application/pdf
  creator: maver001
  date_created: 2025-11-21T08:30:09Z
  date_updated: 2025-11-21T08:30:09Z
  file_id: '62273'
  file_name: dgtb26.pdf
  file_size: 9953811
  relation: main_file
  success: 1
file_date_updated: 2025-11-21T08:30:09Z
has_accepted_license: '1'
intvolume: '        26'
language:
- iso: ger
main_file_link:
- open_access: '1'
oa: '1'
place: Universitätsverlag Potsdam
publication: Zukünfte technischer Bildung
publication_status: published
series_title: 'Jahrestagungen der Deutschen Gesellschaft für Technische Bildung e.V. '
status: public
title: '„Und ich sag mal, Theorie und Praxis ist zweierlei“. Wie können Praxisphasen
  Lehramtsstudierende auf zukünftige Anforderungen vorbereiten? '
type: book_chapter
user_id: '76955'
volume: 26
year: '2025'
...
---
_id: '61932'
abstract:
- lang: eng
  text: <jats:p>Substantial improvements in the performance of optical interconnects
    based on multi-mode fibers are required to support emerging single-channel data
    transmission rates of 200 Gb/s and 400 Gb/s. Future optical components must combine
    very high modulation bandwidths—supporting signaling at 100 Gbaud and 200 Gbaud—with
    reduced spectral width to mitigate chromatic-dispersion-induced pulse broadening
    and increased brightness to further restrict flux-confining area in multi-mode
    fibers and thereby increase the effective modal bandwidth (EMB). A particularly
    promising route to improved performance within standard oxide-confined VCSEL technology
    is the introduction of multiple isolated or optically coupled oxide-confined apertures,
    which we refer to collectively as multi-aperture (MA) VCSEL arrays. We show that
    properly designed MA VCSELs exhibit narrow emission spectra, narrow far-field
    profiles and extended intrinsic modulation bandwidths, enabling longer-reach data
    transmission over both multi-mode (MMF) and single-mode fibers (SMF). One approach
    uses optically isolated apertures with lateral dimensions of approximately 2–3
    µm arranged with a pitch of 10–12 µm or less. Such devices demonstrate relaxation
    oscillation frequencies of around 30 GHz in continuous-wave operation and intrinsic
    modulation bandwidths approaching 50 GHz. Compared with a conventional single-aperture
    VCSELs of equivalent oxide-confined area, MA designs can reduce the spectral width
    (root mean square values &lt; 0.15 nm), lower series resistance (≈50 Ω) and limit
    junction overheating through more efficient multi-spot heat dissipation at the
    same total current. As each aperture lases in a single transverse mode, these
    devices exhibit narrow far-field patterns. In combination with well-defined spacing
    between emitting spots, they permit tailored restricted launch conditions in MMFs,
    enhancing effective modal bandwidth. In another MA approach, the apertures are
    optically coupled such that self-injection locking (SIL) leads to lasing in a
    single supermode. One may regard one of the supermodes as acting as a master mode
    controlling the other one. Streak-camera studies reveal post-pulse oscillations
    in the SIL regime at frequencies up to 100 GHz. MA VCSELs enable a favorable combination
    of wavelength chirp and chromatic dispersion, extending transmission distances
    over MMFs beyond those expected for zero-chirp sources and supporting transfer
    bandwidths up to 60 GHz over kilometer-length SMF links.</jats:p>
article_number: '1037'
author:
- first_name: Nikolay N.
  full_name: Ledentsov, Nikolay N.
  last_name: Ledentsov
- first_name: Nikolay
  full_name: Ledentsov, Nikolay
  last_name: Ledentsov
- first_name: Vitaly A.
  full_name: Shchukin, Vitaly A.
  last_name: Shchukin
- first_name: Alexander N.
  full_name: Ledentsov, Alexander N.
  last_name: Ledentsov
- first_name: Oleg Yu.
  full_name: Makarov, Oleg Yu.
  last_name: Makarov
- first_name: Ilya E.
  full_name: Titkov, Ilya E.
  last_name: Titkov
- first_name: Markus
  full_name: Lindemann, Markus
  last_name: Lindemann
- first_name: Thomas
  full_name: de Adelsburg Ettmayer, Thomas
  last_name: de Adelsburg Ettmayer
- first_name: Nils Christopher
  full_name: Gerhardt, Nils Christopher
  id: '115298'
  last_name: Gerhardt
  orcid: 0009-0002-5538-231X
- first_name: Martin R.
  full_name: Hofmann, Martin R.
  last_name: Hofmann
- first_name: Xin
  full_name: Chen, Xin
  last_name: Chen
- first_name: Jason E.
  full_name: Hurley, Jason E.
  last_name: Hurley
- first_name: Hao
  full_name: Dong, Hao
  last_name: Dong
- first_name: Ming-Jun
  full_name: Li, Ming-Jun
  last_name: Li
citation:
  ama: 'Ledentsov NN, Ledentsov N, Shchukin VA, et al. VCSELs: Influence of Design
    on Performance and Data Transmission over Multi-Mode and Single-Mode Fibers. <i>Photonics</i>.
    2025;12(10). doi:<a href="https://doi.org/10.3390/photonics12101037">10.3390/photonics12101037</a>'
  apa: 'Ledentsov, N. N., Ledentsov, N., Shchukin, V. A., Ledentsov, A. N., Makarov,
    O. Yu., Titkov, I. E., Lindemann, M., de Adelsburg Ettmayer, T., Gerhardt, N.
    C., Hofmann, M. R., Chen, X., Hurley, J. E., Dong, H., &#38; Li, M.-J. (2025).
    VCSELs: Influence of Design on Performance and Data Transmission over Multi-Mode
    and Single-Mode Fibers. <i>Photonics</i>, <i>12</i>(10), Article 1037. <a href="https://doi.org/10.3390/photonics12101037">https://doi.org/10.3390/photonics12101037</a>'
  bibtex: '@article{Ledentsov_Ledentsov_Shchukin_Ledentsov_Makarov_Titkov_Lindemann_de
    Adelsburg Ettmayer_Gerhardt_Hofmann_et al._2025, title={VCSELs: Influence of Design
    on Performance and Data Transmission over Multi-Mode and Single-Mode Fibers},
    volume={12}, DOI={<a href="https://doi.org/10.3390/photonics12101037">10.3390/photonics12101037</a>},
    number={101037}, journal={Photonics}, publisher={MDPI AG}, author={Ledentsov,
    Nikolay N. and Ledentsov, Nikolay and Shchukin, Vitaly A. and Ledentsov, Alexander
    N. and Makarov, Oleg Yu. and Titkov, Ilya E. and Lindemann, Markus and de Adelsburg
    Ettmayer, Thomas and Gerhardt, Nils Christopher and Hofmann, Martin R. and et
    al.}, year={2025} }'
  chicago: 'Ledentsov, Nikolay N., Nikolay Ledentsov, Vitaly A. Shchukin, Alexander
    N. Ledentsov, Oleg Yu. Makarov, Ilya E. Titkov, Markus Lindemann, et al. “VCSELs:
    Influence of Design on Performance and Data Transmission over Multi-Mode and Single-Mode
    Fibers.” <i>Photonics</i> 12, no. 10 (2025). <a href="https://doi.org/10.3390/photonics12101037">https://doi.org/10.3390/photonics12101037</a>.'
  ieee: 'N. N. Ledentsov <i>et al.</i>, “VCSELs: Influence of Design on Performance
    and Data Transmission over Multi-Mode and Single-Mode Fibers,” <i>Photonics</i>,
    vol. 12, no. 10, Art. no. 1037, 2025, doi: <a href="https://doi.org/10.3390/photonics12101037">10.3390/photonics12101037</a>.'
  mla: 'Ledentsov, Nikolay N., et al. “VCSELs: Influence of Design on Performance
    and Data Transmission over Multi-Mode and Single-Mode Fibers.” <i>Photonics</i>,
    vol. 12, no. 10, 1037, MDPI AG, 2025, doi:<a href="https://doi.org/10.3390/photonics12101037">10.3390/photonics12101037</a>.'
  short: N.N. Ledentsov, N. Ledentsov, V.A. Shchukin, A.N. Ledentsov, O.Yu. Makarov,
    I.E. Titkov, M. Lindemann, T. de Adelsburg Ettmayer, N.C. Gerhardt, M.R. Hofmann,
    X. Chen, J.E. Hurley, H. Dong, M.-J. Li, Photonics 12 (2025).
date_created: 2025-10-23T10:59:59Z
date_updated: 2026-02-19T12:39:12Z
department:
- _id: '977'
doi: 10.3390/photonics12101037
intvolume: '        12'
issue: '10'
language:
- iso: eng
publication: Photonics
publication_identifier:
  issn:
  - 2304-6732
publication_status: published
publisher: MDPI AG
status: public
title: 'VCSELs: Influence of Design on Performance and Data Transmission over Multi-Mode
  and Single-Mode Fibers'
type: journal_article
user_id: '15911'
volume: 12
year: '2025'
...
---
_id: '61931'
abstract:
- lang: eng
  text: <jats:p>Recent research revealed that single-mode vertical-cavity surface-emitting
    lasers under spin injection (spin-VCSELs) have the potential to revolutionize
    laser technology for short-haul optical communications. While previous studies
    have focused solely on single-mode operation, this study introduces multimode
    spin-VCSELs. We experimentally demonstrate the existence of multi-resonant polarization
    dynamics when spin is injected, a phenomenon previously unobserved. The development
    opens the door to significantly faster and more efficient optical communication
    systems by harnessing the collective behavior of multiple laser modes. Furthermore,
    we lay the groundwork for understanding multimode operation through the extension
    of the single-mode spin–flip model, which forms the basis for present and future
    analyses of multimode spin-laser operation. This work is an important step toward
    realizing the full potential of spin-VCSELs and, thus, enables significantly improved
    performance of spin-VCSEL-based optical networks in the future.</jats:p>
article_number: '106120'
author:
- first_name: Uliana
  full_name: Diiankova, Uliana
  last_name: Diiankova
- first_name: Mariusz
  full_name: Drong, Mariusz
  last_name: Drong
- first_name: Tobias
  full_name: Pusch, Tobias
  last_name: Pusch
- first_name: Rainer
  full_name: Michalzik, Rainer
  last_name: Michalzik
- first_name: Markus
  full_name: Lindemann, Markus
  last_name: Lindemann
- first_name: Nils Christopher
  full_name: Gerhardt, Nils Christopher
  id: '115298'
  last_name: Gerhardt
  orcid: 0009-0002-5538-231X
- first_name: Martin R.
  full_name: Hofmann, Martin R.
  last_name: Hofmann
citation:
  ama: Diiankova U, Drong M, Pusch T, et al. Multimode vertical-cavity surface-emitting
    lasers under spin injection. <i>APL Photonics</i>. 2025;10(10). doi:<a href="https://doi.org/10.1063/5.0286998">10.1063/5.0286998</a>
  apa: Diiankova, U., Drong, M., Pusch, T., Michalzik, R., Lindemann, M., Gerhardt,
    N. C., &#38; Hofmann, M. R. (2025). Multimode vertical-cavity surface-emitting
    lasers under spin injection. <i>APL Photonics</i>, <i>10</i>(10), Article 106120.
    <a href="https://doi.org/10.1063/5.0286998">https://doi.org/10.1063/5.0286998</a>
  bibtex: '@article{Diiankova_Drong_Pusch_Michalzik_Lindemann_Gerhardt_Hofmann_2025,
    title={Multimode vertical-cavity surface-emitting lasers under spin injection},
    volume={10}, DOI={<a href="https://doi.org/10.1063/5.0286998">10.1063/5.0286998</a>},
    number={10106120}, journal={APL Photonics}, publisher={AIP Publishing}, author={Diiankova,
    Uliana and Drong, Mariusz and Pusch, Tobias and Michalzik, Rainer and Lindemann,
    Markus and Gerhardt, Nils Christopher and Hofmann, Martin R.}, year={2025} }'
  chicago: Diiankova, Uliana, Mariusz Drong, Tobias Pusch, Rainer Michalzik, Markus
    Lindemann, Nils Christopher Gerhardt, and Martin R. Hofmann. “Multimode Vertical-Cavity
    Surface-Emitting Lasers under Spin Injection.” <i>APL Photonics</i> 10, no. 10
    (2025). <a href="https://doi.org/10.1063/5.0286998">https://doi.org/10.1063/5.0286998</a>.
  ieee: 'U. Diiankova <i>et al.</i>, “Multimode vertical-cavity surface-emitting lasers
    under spin injection,” <i>APL Photonics</i>, vol. 10, no. 10, Art. no. 106120,
    2025, doi: <a href="https://doi.org/10.1063/5.0286998">10.1063/5.0286998</a>.'
  mla: Diiankova, Uliana, et al. “Multimode Vertical-Cavity Surface-Emitting Lasers
    under Spin Injection.” <i>APL Photonics</i>, vol. 10, no. 10, 106120, AIP Publishing,
    2025, doi:<a href="https://doi.org/10.1063/5.0286998">10.1063/5.0286998</a>.
  short: U. Diiankova, M. Drong, T. Pusch, R. Michalzik, M. Lindemann, N.C. Gerhardt,
    M.R. Hofmann, APL Photonics 10 (2025).
date_created: 2025-10-23T10:52:59Z
date_updated: 2026-02-19T12:39:00Z
department:
- _id: '977'
doi: 10.1063/5.0286998
intvolume: '        10'
issue: '10'
language:
- iso: eng
publication: APL Photonics
publication_identifier:
  issn:
  - 2378-0967
publication_status: published
publisher: AIP Publishing
status: public
title: Multimode vertical-cavity surface-emitting lasers under spin injection
type: journal_article
user_id: '15911'
volume: 10
year: '2025'
...
---
_id: '64551'
abstract:
- lang: eng
  text: <jats:p>Laterally coupled vertical-cavity surface-emitting lasers (VCSELs)
    can exhibit additional resonances at high modulation frequencies that can substantially
    increase the laser’s modulation bandwidth. State-of-the-art laterally coupled
    devices require non-standard manufacturing technology and precise tuning of the
    currents supplied to each cavity separately to form optical supermodes suitable
    for such resonances. Here, we report on a novel switching phenomenon in laterally
    coupled VCSEL structures having only a single common electric contact and manufactured
    in a standard oxide-confined VCSEL geometry. At lower currents, they can be operated
    in a weakly coupled (WCR) regime and, at higher currents, in an injection-locked
    (IL) regime, enabling fundamentally different spectral and dynamic features. In
    the WCR, both optical supermodes lase and a narrow tunable plasma-assisted peak
    at their beating frequency is observed for each of the apertures, with a current-dependent
    frequency tuning and anti-phase intensity oscillations in each of the cavities.
    In contrast, in the IL regimes, only one (anti-symmetric) supermode lases. This
    adds a broader resonance to the modulation response while the intensity oscillations
    in both cavities are in-phase. Only the IL regime can result in increased modulation
    bandwidth of the system. Measurements of the pulse responses and continuous modulation
    up to 70 GHz for both operational regimes are presented and compared with simulations
    of our distributed rate equation model whose parameters are extracted from full-wave
    electromagnetic simulations of the device, including the temperature distribution
    in the device. Excellent agreement is found and enables comprehensive understanding
    of the dynamics of supermodes in oxide-confined coupled cavity VCSELs.</jats:p>
article_number: '053102'
author:
- first_name: M.
  full_name: Lindemann, M.
  last_name: Lindemann
- first_name: M.
  full_name: D’Alessandro, M.
  last_name: D’Alessandro
- first_name: N.
  full_name: Ledentsov, N.
  last_name: Ledentsov
- first_name: O. Y.
  full_name: Makarov, O. Y.
  last_name: Makarov
- first_name: N. N.
  full_name: Ledentsov, N. N.
  last_name: Ledentsov
- first_name: A.
  full_name: Tibaldi, A.
  last_name: Tibaldi
- first_name: Nils Christopher
  full_name: Gerhardt, Nils Christopher
  id: '115298'
  last_name: Gerhardt
  orcid: 0009-0002-5538-231X
- first_name: M. R.
  full_name: Hofmann, M. R.
  last_name: Hofmann
citation:
  ama: Lindemann M, D’Alessandro M, Ledentsov N, et al. Laterally coupled vertical-cavity
    surface-emitting lasers with                    tunable resonance width and frequency.
    <i>Journal of Applied Physics</i>. 2025;138(5). doi:<a href="https://doi.org/10.1063/5.0275622">10.1063/5.0275622</a>
  apa: Lindemann, M., D’Alessandro, M., Ledentsov, N., Makarov, O. Y., Ledentsov,
    N. N., Tibaldi, A., Gerhardt, N. C., &#38; Hofmann, M. R. (2025). Laterally coupled
    vertical-cavity surface-emitting lasers with                    tunable resonance
    width and frequency. <i>Journal of Applied Physics</i>, <i>138</i>(5), Article
    053102. <a href="https://doi.org/10.1063/5.0275622">https://doi.org/10.1063/5.0275622</a>
  bibtex: '@article{Lindemann_D’Alessandro_Ledentsov_Makarov_Ledentsov_Tibaldi_Gerhardt_Hofmann_2025,
    title={Laterally coupled vertical-cavity surface-emitting lasers with         
              tunable resonance width and frequency}, volume={138}, DOI={<a href="https://doi.org/10.1063/5.0275622">10.1063/5.0275622</a>},
    number={5053102}, journal={Journal of Applied Physics}, publisher={AIP Publishing},
    author={Lindemann, M. and D’Alessandro, M. and Ledentsov, N. and Makarov, O. Y.
    and Ledentsov, N. N. and Tibaldi, A. and Gerhardt, Nils Christopher and Hofmann,
    M. R.}, year={2025} }'
  chicago: Lindemann, M., M. D’Alessandro, N. Ledentsov, O. Y. Makarov, N. N. Ledentsov,
    A. Tibaldi, Nils Christopher Gerhardt, and M. R. Hofmann. “Laterally Coupled Vertical-Cavity
    Surface-Emitting Lasers with                    Tunable Resonance Width and Frequency.”
    <i>Journal of Applied Physics</i> 138, no. 5 (2025). <a href="https://doi.org/10.1063/5.0275622">https://doi.org/10.1063/5.0275622</a>.
  ieee: 'M. Lindemann <i>et al.</i>, “Laterally coupled vertical-cavity surface-emitting
    lasers with                    tunable resonance width and frequency,” <i>Journal
    of Applied Physics</i>, vol. 138, no. 5, Art. no. 053102, 2025, doi: <a href="https://doi.org/10.1063/5.0275622">10.1063/5.0275622</a>.'
  mla: Lindemann, M., et al. “Laterally Coupled Vertical-Cavity Surface-Emitting Lasers
    with                    Tunable Resonance Width and Frequency.” <i>Journal of
    Applied Physics</i>, vol. 138, no. 5, 053102, AIP Publishing, 2025, doi:<a href="https://doi.org/10.1063/5.0275622">10.1063/5.0275622</a>.
  short: M. Lindemann, M. D’Alessandro, N. Ledentsov, O.Y. Makarov, N.N. Ledentsov,
    A. Tibaldi, N.C. Gerhardt, M.R. Hofmann, Journal of Applied Physics 138 (2025).
date_created: 2026-02-20T11:11:12Z
date_updated: 2026-02-20T11:15:05Z
department:
- _id: '977'
doi: 10.1063/5.0275622
intvolume: '       138'
issue: '5'
language:
- iso: eng
publication: Journal of Applied Physics
publication_identifier:
  issn:
  - 0021-8979
  - 1089-7550
publication_status: published
publisher: AIP Publishing
status: public
title: Laterally coupled vertical-cavity surface-emitting lasers with                    tunable
  resonance width and frequency
type: journal_article
user_id: '15911'
volume: 138
year: '2025'
...
---
_id: '64293'
author:
- first_name: Nils Christopher
  full_name: Gerhardt, Nils Christopher
  id: '115298'
  last_name: Gerhardt
  orcid: 0009-0002-5538-231X
- first_name: Martin R.
  full_name: Hofmann, Martin R.
  last_name: Hofmann
- first_name: Leon
  full_name: Zens, Leon
  last_name: Zens
- first_name: Jens
  full_name: Möller, Jens
  last_name: Möller
- first_name: Vira
  full_name: Besaga, Vira
  last_name: Besaga
citation:
  ama: 'Gerhardt NC, Hofmann MR, Zens L, Möller J, Besaga V. Quantitative holography
    for the characterisation of semiconductor amplifieres and lasers. In: <i>Practical
    Holography XXXIX: Displays, Materials, and Applications</i>. ; 2025. doi:<a href="https://doi.org/10.1117/12.3041318">10.1117/12.3041318</a>'
  apa: 'Gerhardt, N. C., Hofmann, M. R., Zens, L., Möller, J., &#38; Besaga, V. (2025).
    Quantitative holography for the characterisation of semiconductor amplifieres
    and lasers. <i>Practical Holography XXXIX: Displays, Materials, and Applications</i>.
    <a href="https://doi.org/10.1117/12.3041318">https://doi.org/10.1117/12.3041318</a>'
  bibtex: '@inproceedings{Gerhardt_Hofmann_Zens_Möller_Besaga_2025, title={Quantitative
    holography for the characterisation of semiconductor amplifieres and lasers},
    DOI={<a href="https://doi.org/10.1117/12.3041318">10.1117/12.3041318</a>}, booktitle={Practical
    Holography XXXIX: Displays, Materials, and Applications}, author={Gerhardt, Nils
    Christopher and Hofmann, Martin R. and Zens, Leon and Möller, Jens and Besaga,
    Vira}, year={2025} }'
  chicago: 'Gerhardt, Nils Christopher, Martin R. Hofmann, Leon Zens, Jens Möller,
    and Vira Besaga. “Quantitative Holography for the Characterisation of Semiconductor
    Amplifieres and Lasers.” In <i>Practical Holography XXXIX: Displays, Materials,
    and Applications</i>, 2025. <a href="https://doi.org/10.1117/12.3041318">https://doi.org/10.1117/12.3041318</a>.'
  ieee: 'N. C. Gerhardt, M. R. Hofmann, L. Zens, J. Möller, and V. Besaga, “Quantitative
    holography for the characterisation of semiconductor amplifieres and lasers,”
    2025, doi: <a href="https://doi.org/10.1117/12.3041318">10.1117/12.3041318</a>.'
  mla: 'Gerhardt, Nils Christopher, et al. “Quantitative Holography for the Characterisation
    of Semiconductor Amplifieres and Lasers.” <i>Practical Holography XXXIX: Displays,
    Materials, and Applications</i>, 2025, doi:<a href="https://doi.org/10.1117/12.3041318">10.1117/12.3041318</a>.'
  short: 'N.C. Gerhardt, M.R. Hofmann, L. Zens, J. Möller, V. Besaga, in: Practical
    Holography XXXIX: Displays, Materials, and Applications, 2025.'
date_created: 2026-02-20T10:03:50Z
date_updated: 2026-02-25T09:34:37Z
department:
- _id: '977'
doi: 10.1117/12.3041318
language:
- iso: eng
publication: 'Practical Holography XXXIX: Displays, Materials, and Applications'
status: public
title: Quantitative holography for the characterisation of semiconductor amplifieres
  and lasers
type: conference
user_id: '15911'
year: '2025'
...
---
_id: '64292'
author:
- first_name: M.
  full_name: Lindemann, M.
  last_name: Lindemann
- first_name: M.
  full_name: D’Alessandro, M.
  last_name: D’Alessandro
- first_name: N.
  full_name: Ledentsov, N.
  last_name: Ledentsov
- first_name: O. Y.
  full_name: Makarov, O. Y.
  last_name: Makarov
- first_name: N. N.
  full_name: Ledentsov, N. N.
  last_name: Ledentsov
- first_name: A.
  full_name: Tibaldi, A.
  last_name: Tibaldi
- first_name: N. C.
  full_name: Gerhardt, N. C.
  last_name: Gerhardt
- first_name: M. R.
  full_name: Hofmann, M. R.
  last_name: Hofmann
citation:
  ama: Lindemann M, D’Alessandro M, Ledentsov N, et al. Laterally coupled vertical-cavity
    surface-emitting lasers with tunable resonance width and frequency. <i>Journal
    of Applied Physics</i>. 2025;138(5). doi:<a href="https://doi.org/10.1063/5.0275622">10.1063/5.0275622</a>
  apa: Lindemann, M., D’Alessandro, M., Ledentsov, N., Makarov, O. Y., Ledentsov,
    N. N., Tibaldi, A., Gerhardt, N. C., &#38; Hofmann, M. R. (2025). Laterally coupled
    vertical-cavity surface-emitting lasers with tunable resonance width and frequency.
    <i>Journal of Applied Physics</i>, <i>138</i>(5). <a href="https://doi.org/10.1063/5.0275622">https://doi.org/10.1063/5.0275622</a>
  bibtex: '@article{Lindemann_D’Alessandro_Ledentsov_Makarov_Ledentsov_Tibaldi_Gerhardt_Hofmann_2025,
    title={Laterally coupled vertical-cavity surface-emitting lasers with tunable
    resonance width and frequency}, volume={138}, DOI={<a href="https://doi.org/10.1063/5.0275622">10.1063/5.0275622</a>},
    number={5}, journal={Journal of Applied Physics}, publisher={AIP Publishing},
    author={Lindemann, M. and D’Alessandro, M. and Ledentsov, N. and Makarov, O. Y.
    and Ledentsov, N. N. and Tibaldi, A. and Gerhardt, N. C. and Hofmann, M. R.},
    year={2025} }'
  chicago: Lindemann, M., M. D’Alessandro, N. Ledentsov, O. Y. Makarov, N. N. Ledentsov,
    A. Tibaldi, N. C. Gerhardt, and M. R. Hofmann. “Laterally Coupled Vertical-Cavity
    Surface-Emitting Lasers with Tunable Resonance Width and Frequency.” <i>Journal
    of Applied Physics</i> 138, no. 5 (2025). <a href="https://doi.org/10.1063/5.0275622">https://doi.org/10.1063/5.0275622</a>.
  ieee: 'M. Lindemann <i>et al.</i>, “Laterally coupled vertical-cavity surface-emitting
    lasers with tunable resonance width and frequency,” <i>Journal of Applied Physics</i>,
    vol. 138, no. 5, 2025, doi: <a href="https://doi.org/10.1063/5.0275622">10.1063/5.0275622</a>.'
  mla: Lindemann, M., et al. “Laterally Coupled Vertical-Cavity Surface-Emitting Lasers
    with Tunable Resonance Width and Frequency.” <i>Journal of Applied Physics</i>,
    vol. 138, no. 5, AIP Publishing, 2025, doi:<a href="https://doi.org/10.1063/5.0275622">10.1063/5.0275622</a>.
  short: M. Lindemann, M. D’Alessandro, N. Ledentsov, O.Y. Makarov, N.N. Ledentsov,
    A. Tibaldi, N.C. Gerhardt, M.R. Hofmann, Journal of Applied Physics 138 (2025).
date_created: 2026-02-20T10:03:50Z
date_updated: 2026-02-25T13:59:32Z
department:
- _id: '977'
doi: 10.1063/5.0275622
intvolume: '       138'
issue: '5'
publication: Journal of Applied Physics
publication_identifier:
  issn:
  - 1089-7550
publisher: AIP Publishing
status: public
title: Laterally coupled vertical-cavity surface-emitting lasers with tunable resonance
  width and frequency
type: journal_article
user_id: '15911'
volume: 138
year: '2025'
...
