Spatial structure and simulations of midwave infrared ultrashort pulse laser frequency conversion in polycrystalline chalcogenide optical materials

Anthony Valenzuela; Aaron Schweinsberg; Jiahui Gu; Miroslav Kolesik; Trenton Ensley; Laura Vanderhoef; Michael Tripepi; Christopher Wolfe; Enam Chowdhury

doi:10.1117/12.2578794

5 March 2021 Spatial structure and simulations of midwave infrared ultrashort pulse laser frequency conversion in polycrystalline chalcogenide optical materials

Anthony Valenzuela, Aaron Schweinsberg, Jiahui Gu, Miroslav Kolesik, Trenton Ensley, Laura Vanderhoef, Michael Tripepi, Christopher Wolfe, Enam Chowdhury

Author Affiliations +

Proceedings Volume 11670, Nonlinear Frequency Generation and Conversion: Materials and Devices XX; 116700C (2021) https://doi.org/10.1117/12.2578794
Event: SPIE LASE, 2021, Online Only

Abstract

We experimentally and theoretically investigate the nonlinear frequency conversion of transparent chalcogenide optical materials using ultrashort midwave infrared laser pulses at 3.6 microns. Evidence of the structure of second through sixth harmonic generation demonstrates different levels of filamentation related to laser intensity, sample thickness, and sample position. Simulations using a (3+1)D model with experimentally measured n₂ values and random quasi phase matching provide good qualitative agreement with experimental data. Together, the data suggests that focusing geometry and material structure play a significant role in harmonic generation in these materials.

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Anthony Valenzuela, Aaron Schweinsberg, Jiahui Gu, Miroslav Kolesik, Trenton Ensley, Laura Vanderhoef, Michael Tripepi, Christopher Wolfe, and Enam Chowdhury "Spatial structure and simulations of midwave infrared ultrashort pulse laser frequency conversion in polycrystalline chalcogenide optical materials", Proc. SPIE 11670, Nonlinear Frequency Generation and Conversion: Materials and Devices XX, 116700C (5 March 2021); https://doi.org/10.1117/12.2578794

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