The effect of chirp and wavelength for ultrafast bulk modification of solids with tightly focused laser pulses

Evgeniy Mareev; Ekaterina Migal; Fedor Potemkin

doi:10.1117/12.2603492

19 November 2021 The effect of chirp and wavelength for ultrafast bulk modification of solids with tightly focused laser pulses

Evgeniy Mareev, Ekaterina Migal, Fedor Potemkin

Author Affiliations +

Proceedings Volume 11910, Laser-Induced Damage in Optical Materials 2021; 119100F (2021) https://doi.org/10.1117/12.2603492
Event: SPIE Laser Damage, 2021, Online Only

Abstract

We report on the clear difference in the behavior of laser-matter interaction of tightly focused high-intensity pulses with the bulk of solids when chirping and tuning the wavelength of the laser driver from near-IR to mid-IR. In transparent dielectrics, laser wavelength scaling leads to the change in the heating mechanism which, in turn, leads to a weak dependence of the plasma formation threshold on the pulse duration in mid-IR (4.6 μm) and a significant impact in the case of the near-IR (1.24 μm) excitation. In the case of semiconductors, the ionization mechanism remains within the framework of the multiphoton approximation, but an increase in the photon order for excitation by mid-IR pulses leads to a decrease in delocalization processes and losses in the prefocal region.

Conference Presentation

Citation Download Citation

Evgeniy Mareev, Ekaterina Migal, and Fedor Potemkin "The effect of chirp and wavelength for ultrafast bulk modification of solids with tightly focused laser pulses", Proc. SPIE 11910, Laser-Induced Damage in Optical Materials 2021, 119100F (19 November 2021); https://doi.org/10.1117/12.2603492

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