The Multifocus Structure of Radiation upon Femtosecond Filamentation of an Optical Vortex in a Medium with an Anomalous Group Velocity Dispersion
| Autor: | V.P. Kandidov, Svyatoslav A Shlenov, E. V. Vasilyev |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Laser 01 natural sciences Molecular physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics Wavelength Filamentation law 0103 physical sciences Femtosecond Dispersion (optics) Group velocity Optical vortex Topological quantum number |
| Zdroj: | Optics and Spectroscopy. 126:16-24 |
| ISSN: | 1562-6911 0030-400X |
| Popis: | We analyze numerically the femtosecond filamentation of a vortex beam with the topological charge m = 1 at wavelength λ0 = 1800 nm in fused silica under anomalous group velocity dispersion conditions. We show that, as a pulse with a fivefold excess of its power over the critical power propagates through the medium, a multifocus ring structure of radiation with a peak intensity of higher than 1013 W/cm2 and surface energy density of about 0.2 J/cm2 is formed. The self-action of the optical vortex is accompanied by the transformation of the spectral energy mainly into the Stokes region. A comparison is made with the case of a normal dispersion of the group velocity upon the self-action of a vortex beam at the wavelength of λ0 = 400 nm. |
| Databáze: | OpenAIRE |
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