WIAS Preprint No. 2634, (2019)

Time-dependent simulation of thermal lensing in high-power broad-area semiconductor lasers


Authors

  • Zeghuzi, Anissa
  • Wünsche, Hans-Jürgen
  • Wenzel, Hans
    ORCID: 0000-0003-1726-0223
  • Radziunas, Mindaugas
    ORCID: 0000-0003-0306-1266
  • Fuhrmann, Jürgen
    ORCID: 0000-0003-4432-2434
  • Klehr, Andreas
  • Bandelow, Uwe
    ORCID: 0000-0003-3677-2347
  • Knigge, Andrea

2010 Mathematics Subject Classification

  • 78A60 35Q60 78-04 70K70 35Q79 81Q37

Keywords

  • Broad-area laser, heat flow, pulsed laser operation, traveling-wave model, thermal lensing, temperature fluctuation

DOI

10.20347/WIAS.PREPRINT.2634

Abstract

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.

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