---
_id: '38051'
abstract:
- lang: eng
text: The characterisation of loss in optical waveguides is essential in
understanding the performance of these devices and their limitations. Whilst interferometric-based
methods generally provide the best results for low-loss waveguides, they are almost
exclusively used to provide characterization in cases where the waveguide is spatially
single-mode. Here, we introduce a Fabry-Pérot-based scheme to estimate the losses
of a nonlinear (birefringent or quasi-phase matched) waveguide at a wavelength
where it is multi-mode. The method involves measuring the generated second harmonic
power as the pump wavelength is scanned over the phase matching region. Furthermore,
it is shown that this method allows one to infer the losses of different second
harmonic spatial modes by scanning the pump field over the separated phase matching
spectra. By fitting the measured phase matching spectra from different titanium
indiffused lithium niobate waveguides to the model presented in this paper, it
is shown that one can estimate the second harmonic losses of a single spatial-mode,
at wavelengths where the waveguides are spatially multi-mode.
article_number: '5507'
author:
- first_name: Matteo
full_name: Santandrea, Matteo
id: '55095'
last_name: Santandrea
orcid: 0000-0001-5718-358X
- first_name: Michael
full_name: Stefszky, Michael
id: '42777'
last_name: Stefszky
- first_name: Ganaël
full_name: Roeland, Ganaël
last_name: Roeland
- first_name: Christine
full_name: Silberhorn, Christine
id: '26263'
last_name: Silberhorn
citation:
ama: Santandrea M, Stefszky M, Roeland G, Silberhorn C. Interferometric method for
determining the losses of spatially multi-mode nonlinear waveguides based on second
harmonic generation. Optics Express. 2020;28(4). doi:10.1364/oe.380788
apa: Santandrea, M., Stefszky, M., Roeland, G., & Silberhorn, C. (2020). Interferometric
method for determining the losses of spatially multi-mode nonlinear waveguides
based on second harmonic generation. Optics Express, 28(4), Article
5507. https://doi.org/10.1364/oe.380788
bibtex: '@article{Santandrea_Stefszky_Roeland_Silberhorn_2020, title={Interferometric
method for determining the losses of spatially multi-mode nonlinear waveguides
based on second harmonic generation.}, volume={28}, DOI={10.1364/oe.380788},
number={45507}, journal={Optics Express}, publisher={Optica Publishing Group},
author={Santandrea, Matteo and Stefszky, Michael and Roeland, Ganaël and Silberhorn,
Christine}, year={2020} }'
chicago: Santandrea, Matteo, Michael Stefszky, Ganaël Roeland, and Christine Silberhorn.
“Interferometric Method for Determining the Losses of Spatially Multi-Mode Nonlinear
Waveguides Based on Second Harmonic Generation.” Optics Express 28, no.
4 (2020). https://doi.org/10.1364/oe.380788.
ieee: 'M. Santandrea, M. Stefszky, G. Roeland, and C. Silberhorn, “Interferometric
method for determining the losses of spatially multi-mode nonlinear waveguides
based on second harmonic generation.,” Optics Express, vol. 28, no. 4,
Art. no. 5507, 2020, doi: 10.1364/oe.380788.'
mla: Santandrea, Matteo, et al. “Interferometric Method for Determining the Losses
of Spatially Multi-Mode Nonlinear Waveguides Based on Second Harmonic Generation.”
Optics Express, vol. 28, no. 4, 5507, Optica Publishing Group, 2020, doi:10.1364/oe.380788.
short: M. Santandrea, M. Stefszky, G. Roeland, C. Silberhorn, Optics Express 28
(2020).
date_created: 2023-01-23T09:51:53Z
date_updated: 2023-02-01T10:04:19Z
department:
- _id: '288'
doi: 10.1364/oe.380788
intvolume: ' 28'
issue: '4'
keyword:
- Atomic and Molecular Physics
- and Optics
language:
- iso: eng
publication: Optics Express
publication_identifier:
issn:
- 1094-4087
publication_status: published
publisher: Optica Publishing Group
status: public
title: Interferometric method for determining the losses of spatially multi-mode nonlinear
waveguides based on second harmonic generation.
type: journal_article
user_id: '42777'
volume: 28
year: '2020'
...