Filamentation of high-power femtosecond laser pulses with full and partial amplitude modulation by a mesh mask

Yu. E. Geints; O. V. Minina

doi:10.1117/12.3005548

2 November 2023 Filamentation of high-power femtosecond laser pulses with full and partial amplitude modulation by a mesh mask

Yu. E. Geints, O. V. Minina

Author Affiliations +

Proceedings Volume 12920, XVI International Conference on Pulsed Lasers and Laser Applications; 1292004 (2023) https://doi.org/10.1117/12.3005548
Event: XVI International Conference on Pulsed Lasers and Laser Applications, 2023, Tomsk, Russian Federation

Abstract

Numerical simulation of high-power femtosecond laser pulse propagation in air under conditions of amplitude modulation by metal wire-mesh masks are carried out. The use of such modulation masks leads to splitting of initial laser beam into separate parts (subbeams) of lower energy. Such spatial structuring of optical radiation causes large-scale diffraction interaction between subbeams, which leads to regularization of the diffraction pattern formed at the stage of pulse self-focusing. It is shown that the use of modulation meshes generally reduces the total length of the beam filamentation, but significantly increases the longitudinal continuity of the laser plasma density distribution in laser filaments. For full-scale meshes providing modulation of the entire beam area the formed filamentation region demonstrates larger extent than by using meshes with partial beam covering.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yu. E. Geints and O. V. Minina "Filamentation of high-power femtosecond laser pulses with full and partial amplitude modulation by a mesh mask", Proc. SPIE 12920, XVI International Conference on Pulsed Lasers and Laser Applications, 1292004 (2 November 2023); https://doi.org/10.1117/12.3005548

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