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High-order mid-IR multiphoton absorption and nonlinear refraction in GaP, ZnSe, GaSe, and ZGP crystals

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Abstract

Using Z-scan and femtosecond 2.35-μm pulses, we study high-order nonlinear effects in monocrystals. We find the multiphoton absorption order N varies from N=6 (GaP, ZnSe) to N=4 (GaSe, ZGP), in accordance with the crystals’ bandgaps.

© 2021 The Author(s)

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