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Title: Femtosecond laser pulse filamentation under anomalous dispersion in fused silica. Part 2. Experiment and physical interpretation

Abstract

We have studied experimentally and analytically the formation of the supercontinuum (SC) spectrum during femtosecond laser pulse filamentation in fused silica under conditions of zero and anomalous group velocity dispersions. It is found that with increasing centre wavelength from 1300 to 2300 nm, the SC spectrum of the anti-Stokes wing narrows, shifting to the blue. It is shown that the anti-Stokes (blue) shift of the SC spectrum increases with the multiphoton order of the medium ionisation by the light field in the filament. It is found that a broad minimum in the SC spectrum, separating the anti-Stokes wing from the centre wavelength, is a result of the interference of radiation from a moving broadband source, stemming from self-phase modulation of the high-intensity light field. The interference factors of the SC spectra obtained for this source, which moves along the emitting region of the filament in a dispersive medium, are in agreement with experimental and numerical results. (nonlinear optical phenomena)

Authors:
; ; ;
Publication Date:
OSTI Identifier:
22066636
Resource Type:
Journal Article
Journal Name:
Quantum Electronics (Woodbury, N.Y.)
Additional Journal Information:
Journal Volume: 42; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7818
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DISPERSIONS; FILAMENTS; INTERFERENCE; IONIZATION; LASERS; MODULATION; MULTI-PHOTON PROCESSES; NONLINEAR OPTICS; NUMERICAL ANALYSIS; PULSES; SILICA; VELOCITY; VISIBLE RADIATION

Citation Formats

Smetanina, E O, Kompanets, V O, Chekalin, Sergei V, and Kandidov, V P. Femtosecond laser pulse filamentation under anomalous dispersion in fused silica. Part 2. Experiment and physical interpretation. United States: N. p., 2012. Web. doi:10.1070/QE2012V042N10ABEH014896.
Smetanina, E O, Kompanets, V O, Chekalin, Sergei V, & Kandidov, V P. Femtosecond laser pulse filamentation under anomalous dispersion in fused silica. Part 2. Experiment and physical interpretation. United States. doi:10.1070/QE2012V042N10ABEH014896.
Smetanina, E O, Kompanets, V O, Chekalin, Sergei V, and Kandidov, V P. Wed . "Femtosecond laser pulse filamentation under anomalous dispersion in fused silica. Part 2. Experiment and physical interpretation". United States. doi:10.1070/QE2012V042N10ABEH014896.
@article{osti_22066636,
title = {Femtosecond laser pulse filamentation under anomalous dispersion in fused silica. Part 2. Experiment and physical interpretation},
author = {Smetanina, E O and Kompanets, V O and Chekalin, Sergei V and Kandidov, V P},
abstractNote = {We have studied experimentally and analytically the formation of the supercontinuum (SC) spectrum during femtosecond laser pulse filamentation in fused silica under conditions of zero and anomalous group velocity dispersions. It is found that with increasing centre wavelength from 1300 to 2300 nm, the SC spectrum of the anti-Stokes wing narrows, shifting to the blue. It is shown that the anti-Stokes (blue) shift of the SC spectrum increases with the multiphoton order of the medium ionisation by the light field in the filament. It is found that a broad minimum in the SC spectrum, separating the anti-Stokes wing from the centre wavelength, is a result of the interference of radiation from a moving broadband source, stemming from self-phase modulation of the high-intensity light field. The interference factors of the SC spectra obtained for this source, which moves along the emitting region of the filament in a dispersive medium, are in agreement with experimental and numerical results. (nonlinear optical phenomena)},
doi = {10.1070/QE2012V042N10ABEH014896},
journal = {Quantum Electronics (Woodbury, N.Y.)},
issn = {1063-7818},
number = 10,
volume = 42,
place = {United States},
year = {2012},
month = {10}
}