Journal
QUANTUM ELECTRONICS
Volume 42, Issue 10, Pages 920-924Publisher
TURPION LTD
DOI: 10.1070/QE2012v042n10ABEH014896
Keywords
filamentation; supercontinuum generation; conical emission
Funding
- Russian Foundation for Basic Research [11-02-00556a, 12-02-31690]
- scientific school [NSh-1049.2012.2]
- Russian Federation for State Support of Leading Scientific Schools of the Russian Federation [NSh-6897.2012.2]
- Ministry of Education and Science of the Russian Federation [8393]
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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.
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