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High-NA Focusing of Ultrashort Laser Pulses in Bulk of ZnSe

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Abstract

A study of high-NA focusing process of ultrashort laser pulses in bulk of ZnSe has been carried out. It is shown that when focusing laser Gaussian beam with high-aperture lenses into a transparent medium aberration distortions occur leading to an increase in focal spot size. The results of experimental studies on ablation of front and back surfaces of a plane-parallel plate with 4 mm thickness made of ZnSe by laser pulses with a duration of 0.3, 1, 10 ps and a wavelength of 1030 nm focused by a micro lens (NA = 0.55) are presented. It is shown that at low pulse energies focusing can be considered in a linear mode in which focal spot size is due to aberration distortions.

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Funding

The authors are grateful to the Russian Science Foundation for the financial support of these studies within the framework of project 21-79-30063.

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Correspondence to Yu. S. Gulina.

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Gulina, Y.S., Kudryashov, S.I., Smirnov, N.A. et al. High-NA Focusing of Ultrashort Laser Pulses in Bulk of ZnSe. Opt. Spectrosc. 131, 980–985 (2023). https://doi.org/10.1134/S0030400X23100077

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