Understanding multi‑kW diode laser pump delivery in amplifiers via data‑validated ray tracing

Computational Optics, pp. 14

Abstract

Ray tracing enables accurate design, optimization, and tolerance analysis of complex optical systems but relies on accurate beam source modelling. Diode lasers, though efficient and compact, exhibit highly complex spatial, angular, spectral, and polarization behaviour due to emitter geometry and packaging-induced thermo-mechanical stress. This work presents multi-layer characterization of laser diode stacks, bars, and single emitters to generate digital shadows that capture these effects. The resulting source models significantly improve ray-tracing predictions, demonstrated on an ILT-designed pump engine for a satellite-based Doppler wind lidar using eight polarization-coupled high-power diode stacks with more than 9 kW peak power.

Authors 4

1. Lucas Warnecke Aachen Fraunhofer-Institut für Lasertechnik ILT

   Fraunhofer Institute for Laser Technology · RWTH Aachen University

   Affiliation as printed

   Fraunhofer-Institut für Lasertechnik ILT (Germany)

   RWTH Aachen Univ. (Germany)

2. Sarah Harrell Klein Aachen Fraunhofer-Institut für Lasertechnik ILT

   Fraunhofer Institute for Laser Technology

   Affiliation as printed

   Fraunhofer-Institut für Lasertechnik ILT (Germany)

3. Martin Traub Aachen Fraunhofer-Institut für Lasertechnik ILT

   Fraunhofer Institute for Laser Technology

   Affiliation as printed

   Fraunhofer-Institut für Lasertechnik ILT (Germany)

4. Jenny Knöfelt Aachen Fraunhofer-Institut für Lasertechnik ILT

   Fraunhofer Institute for Laser Technology

   Affiliation as printed

   Fraunhofer-Institut für Lasertechnik ILT (Germany)