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Experimental study of high-intensity light channels produced on an extended air path by phase and amplitude modulated femtosecond laser pulses

Authors :
D. V. Apeksimov
Yu. E. Geints
G. G. Matvienko
V. K. Oshlakov
A. A. Zemlyanov
Source :
Applied Optics. 61:1300
Publication Year :
2022
Publisher :
Optica Publishing Group, 2022.

Abstract

We present the results of our experimental study of the propagation dynamics of high-power femtosecond laser radiation in air with initially imposed amplitude and/or phase modulations. Depending on the modulation type and magnitude, the laser pulse upon nonlinear propagation breaks up into several high-intensity spatially localized light channels, which may or may not contain air plasma and thus are referred to as laser filaments, post-filaments, or plasmaless channels. The pulse modulations are implemented by means of control of the phase or amplitude front using a bimorph deformable mirror or amplitude masks, respectively. We show that the distance of formation and spatial length of high-intensity light channels along a propagation path strongly depend on the shapes and spatial positions of the inhomogeneities created in the transverse phase/amplitude pulse profile, but weakly depend on their sizes.

Details

ISSN :
21553165 and 1559128X
Volume :
61
Database :
OpenAIRE
Journal :
Applied Optics
Accession number :
edsair.doi.dedup.....1409fae219e11304dfefc5034a9a9bae
Full Text :
https://doi.org/10.1364/ao.447023