Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 30: Poster 2
HL 30.14: Poster
Thursday, September 8, 2022, 11:00–13:00, P3
Spectral and temporal behavior of the near field of 10 µm broad area blue laser diodes — •Dominic J. Kunzmann1, Lukas Uhlig1, Jannina J. Tepaß1, Anna Kafar2,3, Szymon Stanczyk2,3, Piotr Perlin2,3, and Ulrich T. Schwarz1 — 1University of Technology Chemnitz, 09126 Chemnitz, Germany — 2Institute of High Pressure Physics PAS, Warsaw, Poland — 3TOP-GAN Ltd., Warsaw, Poland
We investigate the near field for the laser diodes driven in pulsed conditions with pulse lengths in the range of a few 10 ns up to 100 ns and currents from 1.5 Ith to 4 Ith. A streak camera image and a high resolved longitudinal mode spectrum are taken at each point of a near field scan for blue laser diodes with a 10 µm broad ridge.
The combination of the streak camera setup and the high resolution spectrometer allows us to investigate: the spectral-lateral-temporal behavior with complex dynamics due to lateral-longitudinal mode competition, the wavelength shift at the lasing onset and on the other hand to get the longitudinal mode spectrum. Different mode combs are interacting in this longitudinal mode spectrum and the predominating mode comb changes for different parts of the spectrum.
An increasing laser current leads to a broadening of the spectrum as well as to the filling of the gain volume, while for higher currents the lateral distribution seems to be similar across the whole spectrum. Comparing these results to previously measured devices with a 40 µm broad ridge, we observe a less homogeneous near field distribution with a slight systematic asymmetry.