Femtosecond multiple filamentation of an optical vortex in the mid-IR wavelength range in fused silica and fluorides

Abstract The results of experimental and theoretical study of the self-action of femtosecond optical vortices in the region of anomalous group velocity dispersion in fused silica and fluorides are presented. Multiple filamentation of an axially asymmetric annular beam with a phase dislocation of top...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2022-04, Vol.52 (4), p.322-327
Main Authors: Shlenov, S.A., Kompanets, V.O., Dergachev, A.A., Kandidov, V.P., Chekalin, S.V., Soifer, F.I.
Format: Article
Language:English
Subjects:
Channels
critical power
Electron beams
femtosecond pulses
filament plasma channels
Filaments
Fluorides
Fused silica
Gaussian beams (optics)
Group velocity
LiF crystal
Lithium fluoride
multiple filamentation
optical vortex
phase dislocation
Vortices
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Summary:Abstract The results of experimental and theoretical study of the self-action of femtosecond optical vortices in the region of anomalous group velocity dispersion in fused silica and fluorides are presented. Multiple filamentation of an axially asymmetric annular beam with a phase dislocation of topological charge m = 1 at a wavelength of 1800 nm in a LiF crystal is investigated. It is found that for the experimentally recorded intensity profile of a vortex beam with two maxima on the diameter, the critical self-focusing power is approximately two times larger than the critical power of a unimodal Gaussian beam. In pulses with supercritical power in the vicinity of the intensity maxima, two coupled filaments, separated by a phase dislocation, are formed on the annular profile of the optical vortex, which prevents energy exchange during their formation. The length of vortex-beam plasma channels in a single pulse is found to be about 300 μm at a diameter of about 2 μm, which is close to the characteristics of plasma channels in a Gaussian beam.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL18028