TY - JOUR AB - An electric field applied to a semiconductor reduces its crystal symmetry and modifies its electronic structure which is expected to result in changes of the linear and nonlinear response to optical excitation. In GaAs, we observe experimentally strong electric field effects on the optical second (SHG) and third (THG) harmonic generation. The SHG signal for the laser-light k vector parallel to the [001] crystal axis is symmetry forbidden in the electric-dipole approximation, but can be induced by an applied electric field in the vicinity of the 1s exciton energy. Surprisingly, the THG signal, which is allowed in this geometry, is considerably reduced by the electric field. We develop a theory which provides good agreement with the experimental data. In particular, it shows that the optical nonlinearities for the 1s exciton resonance are modified in an electric field by the Stark effect, which mixes the 1s and 2p exciton states of opposite parity. This mixing acts in opposite way on the SHG and THG processes, as it leads to the appearance of forbidden SHG in (001)-oriented GaAs and decreases the crystallographic THG. AU - Brunne, D. AU - Lafrentz, M. AU - Pavlov, V. V. AU - Pisarev, R. V. AU - Rodina, A. V. AU - Yakovlev, D. R. AU - Bayer, M. ID - 6522 IS - 8 JF - Physical Review B SN - 1098-0121 TI - Electric field effect on optical harmonic generation at the exciton resonances in GaAs VL - 92 ER - TY - JOUR AB - We use a picosecond acoustics technique to modulate the laser output of electrically pumped GaAs/AlAs micropillar lasers with InGaAs quantum dots. The modulation of the emission wavelength takes place on the frequencies of the nanomechanical extensional and breathing (radial) modes of the micropillars. The amplitude of the modulation for various nanomechanical modes is different for every micropillar which is explained by a various elastic contact between the micropillar walls and polymer environment. AU - Czerniuk, T. AU - Tepper, J. AU - Akimov, A. V. AU - Unsleber, S. AU - Schneider, C. AU - Kamp, M. AU - Höfling, S. AU - Yakovlev, D. R. AU - Bayer, M. ID - 6524 IS - 4 JF - Applied Physics Letters SN - 0003-6951 TI - Impact of nanomechanical resonances on lasing from electrically pumped quantum dot micropillars VL - 106 ER - TY - JOUR AB - We introduce photon-statistics excitation spectroscopy and exemplarily apply it to a quantum-dot micropillar laser. Both the intensity and the photon number statistics of the emission from the micropillar show a strong dependence on the photon statistics of the light used for excitation of the sample. The results under coherent and pseudothermal excitation reveal that a description of the laser properties in terms of mean input photon numbers is not sufficient. It is demonstrated that the micropillar acts as a superthermal light source when operated close to its threshold. Possible applications for important spectroscopic techniques are discussed. AU - Kazimierczuk, T. AU - Schmutzler, J. AU - Aßmann, M. AU - Schneider, C. AU - Kamp, M. AU - Höfling, S. AU - Bayer, M. ID - 6526 IS - 2 JF - Physical Review Letters SN - 0031-9007 TI - Photon-Statistics Excitation Spectroscopy of a Quantum-Dot Micropillar Laser VL - 115 ER - TY - CONF AU - Yakovlev, D. R. AU - Warkentin, W. AU - Brunne, D. AU - Mund, J. AU - Pavlov, V. V. AU - Rodina, A. V. AU - Pisarev, R. V. AU - Bayer, M. ED - Bertolotti, Mario ED - Haus, Joseph W. ED - Zheltikov, Alexei M. ID - 6529 T2 - Nonlinear Optics and Applications IX TI - Novel mechanisms of optical harmonic generation on excitons in semiconductors ER - TY - CONF AU - Claes, Leander AU - Bause, Fabian AU - Rautenberg, Jens AU - Henning, Bernd ID - 6554 KW - piezoceramics KW - strip transducers KW - plate waveguide KW - dispersion diagram T2 - Proceedings SENSOR 2015 TI - Detection of ultrasonic plate waves using ceramic strip transducers ER - TY - JOUR AU - Scheer, David AU - Scholz, Markus AU - Rank, Astrid AU - Donie, Christian ID - 6612 IS - 3 JF - Journal of Cognitive Education and Psychology TI - Inclusive Beliefs and Self-Efficacy Concerning Inclusive Education Among German Teacher Trainees and Student Teachers VL - 14 ER - TY - JOUR AU - Scheer, David AU - Scholz, Markus AU - Rank, Astrid AU - Donie, Christian ID - 6613 IS - 8 JF - Zeitschrift für Heilpädagogik TI - „Alle außer Aaron...“ – Fallbezogene Selbstwirksamkeitserwartungen, Einstellungen und Überzeugungen zukünftiger Lehrkräfte im Kontext Inklusion VL - 66 ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Krauter, Stefan ID - 6656 T2 - Proceedings of the 95th AMS Annual Meeting TI - Measurement and Analysis of offshore fog occurrences ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Bermpohl, Wolfgang ID - 6657 T2 - Wissenschaftliche Verhandlungen 2015 der Deutschen Physikalischen Gesellschaft TI - Messtechnisches Prinzip eines neuen Einstrahlungsmessgerätes ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Krauter, Stefan ID - 6658 T2 - Proceedings of the DEWEK 2015 TI - Performance of MERRA Data in Offshore Wind Energy Applications ER - TY - CONF AU - Bendfeld, Jörg AU - Bouyraaman, Yassin AU - Balluff, Stefan AU - Krauter, Stefan ID - 6659 T2 - Proceedings of the DEWEK 2015 TI - Advanced Integration of Offshore Wind Energy into the Grid System by Power to Gas ER - TY - CONF AU - Sadati, A.M. AU - Krauter, Stefan AU - Bendfeld, Jörg ID - 6661 SN - 9781467371711 T2 - 2015 5th International Youth Conference on Energy (IYCE) TI - Comparison of micro inverters based on practical analysis ER - TY - CONF AU - Krauter, Stefan ID - 6662 SN - 9781479979448 T2 - 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) TI - Effective large-scale PV integration: Methods to match load profile with actual PV output ER - TY - CONF AU - Pendieu Kwaye, M. AU - Bendfeld, Jörg AU - Anglani, N. ID - 6663 SN - 9781467371711 T2 - 2015 5th International Youth Conference on Energy (IYCE) TI - Assessment of renewable energy resources in cameroon and special regards on energy supply ER - TY - CONF AU - Pendieu Kwaye, M. AU - Bendfeld, Jörg AU - Anglani, N. ID - 6664 SN - 9781467371711 T2 - 2015 5th International Youth Conference on Energy (IYCE) TI - Assessment of renewable energy resources and the use of hydro power for fluctuation compensation in Cameroon ER - TY - CONF AU - Krauter, Stefan AU - Bendfeld, Jörg ID - 6665 SN - 9781479979448 T2 - 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) TI - Cost, performance, and yield comparison of eight different micro-inverters ER - TY - CONF AU - Krauter, Stefan ID - 6666 SN - 9781479979448 T2 - 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) TI - BOS cost reduction via direct PV charging of electrical vehicles ER - TY - CONF AU - Bendfeld, Jörg AU - Bouyraaman, Yassin AU - Balluff, Stefan AU - Krauter, Stefan ID - 6667 T2 - Proceedings of the Karlsruhe Institute of Technology (KIT) - Energy Science Technology 2015 TI - Stabilizing offshore wind farm power feed-in via power to gas storage systems ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Krauter, Stefan ID - 6668 T2 - Proceedings of the Karlsruhe Institute of Technology (KIT) - Energy Science Technology 2015 TI - Discovering the potential for offshore windfarms trough measurements ER - TY - CONF AU - Bendfeld, Jörg AU - Balluff, Stefan AU - Krauter, Stefan ID - 6669 T2 - Proceedings of the 10th Conference on Sustainable Development of Energy, Water and Enviroment Systems - SDEWES TI - Wind power forecasting for offshore wind farms ER -