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Multi-physical modeling of thermal and dispersive effects in optical systems for high power ultra-short laser pulses

: Bonhoff, T.; Stollenwerk, J.; Loosen, P.


Kaierle, S. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
High-Power Laser Materials Processing. Applications, Diagnostics, and Systems VII : 27 January - 1 February 2018, San Francisco, California, United States
Bellingham, WA: SPIE, 2018 (Proceedings of SPIE 10525)
Paper 1052504, 9 S.
Conference "High-Power Laser Materials Processing - Applications, Diagnostics, and Systems" <7, 2018, San Francisco/Calif.>
Fraunhofer ILT ()

At high average power, ultra-short laser pulses (<1 ps) are not only affected by dispersive effects but also by thermallyinduced effects in the optical elements. In order to study those effects, we have developed a multi-physical simulation approach. It enables the analysis of the propagation of ultra-short pulses in the spatial and temporal regime against the background of the temperature-dependent refractive index profile, surface deformations, and dispersive effects. The simulation couples a thermo-mechanical finite element analysis and an optical analysis, using both ray-tracing and waveoptical methods. As case example, the influence of thermal and dispersive effects in a non-achromatic singlet lens and an achromatic doublet lens are analyzed and compared.