Regensburg 2019 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 35: HL Poster II

HL 35.58: Poster

Wednesday, April 3, 2019, 17:30–20:00, Poster E

Characterization of mode competition phenomena in (Al,In)GaN laser diodes — •Lukas Uhlig, Eduard Kuhn, Matthias Wachs, Angela Thränhardt, and Ulrich T. Schwarz — Institute of Physics, Chemnitz University of Technology

(Al,In)GaN laser diodes have various recent applications, such as laser projection systems in augmented/virtual reality glasses, which require a modulation with frequencies ranging from 100 MHz to 1 GHz. Laser diodes show a rich dynamic behavior of the longitudinal modes on a nanosecond to microsecond time scale. We investigate the spectral-temporal dynamics of green InGaN laser diodes in high resolution using a streak camera setup combined with a monochromator. For interpretation we simulate the longitudinal mode dynamics using a multi-mode rate equation model.

The observed effects at pulse onset include the turn-on delay and relaxation oscillations as well as a fast red shift. In longer pulses, we investigate mode competition with mode hopping towards longer wavelengths, which repeats cyclically. Single shot measurements show significant variations between single pulses. Consequently, much of the dynamics cannot be observed in usual averaged / time-integrated characterization.