SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 33: Poster II

HL 33.40: Poster

Wednesday, March 29, 2023, 17:00–19:00, P1

High Resolution Spectroscopy for (Al,In)GaN Laser Diodes — •Dominic J. Kunzmann, Raphael Kohlstedt, and Ulrich T. Schwarz — TU Chemnitz, 09126 Chemnitz, Germany

We investigate laser diodes based on the (Al,In)GaN material system with the help of high-resolution spectroscopy. Therefore, we use two setups, one with a grating spectrometer and a Fabry-Pérot-Interferometer. The grating spectrometer is used to measure the longitudinal mode spectra above and below the threshold current. Below the threshold we perform Hakki-Paoli gain spectroscopy to obtain the internal losses of laser diodes which is getting even more challenging, when the diodes get better and the losses smaller. Above the threshold wavelength shifts with current and temperature can be observed and with these shifts the thermal resistance is available. Additionally for broad ridge high power laser diodes the interplay of different longitudinal mode combs is investigated with the high-resolution spectrometer. The Fabry-Pérot-Interferometer enables us to go to even higher resolutions and to verify single mode behavior of laser sources and to observe much smaller wavelength shifts.