Journal
LASER PHYSICS
Volume 19, Issue 10, Pages 1993-2001Publisher
IOP PUBLISHING LTD
DOI: 10.1134/S1054660X09190062
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Funding
- Russian Foundation for Basic Research [08-02-00517-a]
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A simple interference model is proposed for conical emission frequency-angular spectrum formation during the filamentation of femtosecond laser pulse in a nonlinear dispersive medium. The model allows to obtain analytical expressions for frequency-angular distributions of the supercontinuum spectral components of pulses at different wavelengths in media with arbitrary material dispersion law. The model reproduces the supercontinuum frequency-angular spectrum transformation for the case of laser pulse splitting into several subpulses and for multiple refocusing of the light field in filament. Frequency-angular spectra analytically calculated from the proposed interference model are in good agreement with the results of numerical simulations performed for the filamentation of femtosecond laser pulses in fused silica.
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