Аннотация:We demonstrate that amplitude modulation of a high-power femtosecond laser pulse allows to change fundamentally frequency-angular structure of the supercontinuum formed during the filamentation in both molecular and atomic gases. Particularly, modulation with a 4-hole mask strongly suppresses conical emission in the anti-Stokes wing of pulse spectrum with simultaneous enhancement in the Stokes band. We explain this phenomenon as a joint effect of diffraction, self-phase modulation and temporal pulse splitting of interfering beamlets formed by the modulation mask. Our results pave a way for tailoring the frequency-angular structure of filament-generated supercontinuum.
