Filamentation of a phase-modulated pulse under conditions of normal, anomalous and zero group velocity dispersionстатья
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Дата последнего поиска статьи во внешних источниках: 10 ноября 2014 г.
Аннотация:We have investigated experimentally and numerically
the influence of the initial temporal phase modulation of a pulse on
the spatiotemporal intensity distribution and the frequency-angular
spectrum of femtosecond laser pulses with self-channelling in a condensed
medium. We have detected a decrease in the intensity of
divergent anti-Stokes frequency components during filamentation
of radiation under conditions of normal group-velocity dispersion
(GVD) and strong phase modulation. In the zero-GVD regime under
conditions of the phase modulation of radiation, the spatiotemporal
transformation of the pulse is similar to that in the normal-GVD
regime, which leads to a qualitative change in the supercontinuum
spectrum. In the anomalous-GVD regime, a sequence of ‘light
bullets’ is formed in the filament for both a phase-modulated and a
transform-limited pulse.