Formation of conical emission of supercontinuum during filamentation of femtosecond laser radiation in fused silica |
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Authors: | V P Kandidov E O Smetanina A E Dormidonov V O Kompanets S V Chekalin |
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Institution: | 1.Moscow State University,Moscow,Russia;2.Institute of Spectroscopy,Russian Academy of Sciences,Troitsk, Moscow oblast,Russia |
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Abstract: | The formation of conical emission of supercontinuum during filamentation of femtosecond laser pulses with central wavelengths
in a wide range is studied experimentally, numerically, and analytically. The frequency-angular intensity distribution of
the spectral components of conical emission is determined by the interference of supercontinuum emission in a filament of
a femtosecond laser pulse. The interference of supercontinuum emission has a general character, exists at different regimes
of group velocity dispersion, gives rise to the fine spectral structure after the pulse splitting into subpulses and the formation
of a distributed supercontinuum source in an extended filament, and causes the decomposition of the continuous spectrum of
conical emission into many high-contrast maxima after pulse refocusing in the filament. In spectroscopic studies with a tunable
femtosecond radiation source based on a TOPAS parametric amplifier, we used an original scheme with a wedge fused silica sample.
Numerical simulations have been performed using a system of equations of nonlinear-optical interaction of laser radiation
under conditions of diffraction, wave nonstationarity, and material dispersion in fused silica. The analytic study is based
on the interference model of formation of conical emission by supercontinuum sources moving in a filament. |
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