Spectral Broadening of Femtosecond Optical Vortices at Filamentation in Fused Silica under the Conditions of the Anomalous Group Velocity Dispersion

Features of the spectral broadening of femtosecond optical vortices at self-action in a medium with the anomalous group velocity dispersion have been studied experimentally and numerically. It has been found that the broadening of the frequency–angular spectrum is accompanied by the appearance of lo...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2021-03, Vol.132 (3), p.334-340
Main Authors: Shlenov, S. A., Vasilyev, E. V., Chekalin, S. V., Kompanets, V. O., Skidanov, R. V.
Format: Article
Language:English
Subjects:
Atoms
Classical and Quantum Gravitation
Computational fluid dynamics
Dispersion
Elementary Particles
Fused silica
Gaussian beams (optics)
Group velocity
Molecules
Optics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theory
Relativity Theory
Silica
Silicon dioxide
Solid State Physics
Vortices
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Summary:Features of the spectral broadening of femtosecond optical vortices at self-action in a medium with the anomalous group velocity dispersion have been studied experimentally and numerically. It has been found that the broadening of the frequency–angular spectrum is accompanied by the appearance of localized maxima in the Stokes and anti-Stokes regions, which have a strip structure, near the nonlinear focus. It has been shown that in the medium with the anomalous group velocity dispersion the broadening of the spectrum in an optical vortex is smaller than that in a Gaussian beam at the same excess of the power above the critical value.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776121030183