WIAS Preprint No. 2634, (2019)
Time-dependent simulation of thermal lensing in high-power broad-area semiconductor lasers
- Zeghuzi, Anissa
- Wünsche, Hans-Jürgen
- Wenzel, Hans
- Radziunas, Mindaugas
- Fuhrmann, Jürgen
- Klehr, Andreas
- Bandelow, Uwe
- Knigge, Andrea
2010 Mathematics Subject Classification
- 78A60 35Q60 78-04 70K70 35Q79 81Q37
- Broad-area laser, heat flow, pulsed laser operation, traveling-wave model, thermal lensing, temperature fluctuation
We propose a physically realistic and yet numerically applicable thermal model to account for short and long term self-heating within broad-area lasers. Although the temperature increase is small under pulsed operation, a waveguide that is formed within a few-ns-long pulse can result in a transition from a gain-guided to an index-guided structure, leading to near and far field narrowing. Under continuous wave operation the longitudinally varying temperature profile is obtained self-consistently. The resulting unfavorable narrowing of the near field can be successfully counteracted by etching trenches.
- IEEE J. Select. Topics Quantum Electron., 25 (2019), 1502310, DOI 10.1109/JSTQE.2019.2925926 .