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As power densities of laser diodes continuously increase, the effects of absorption losses in fast axis collimation lenses become exceedingly important. We report our analysis of two drivers of these absorption losses, coating absorption and glass bulk absorption, and how these absorption losses cause a thermal impact and have an influence on the performance of the laser beam quality emitted from a laser diode equipped with a fast axis collimation lens on a bottom tab. The presented results are derived from finite element method (FEM) simulations and the FEM model used is based on material data from data sheets and a heat transfer coefficient derived from cooling curves of components observed by a thermal infrared camera.
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M. Huber, F. Saupe, P. Wuest, H. Forrer, A. Kunz, H. Moser, "Impact of absorption in fast axis collimation lenses," Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 105130P (26 February 2018); https://doi.org/10.1117/12.2291672