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Title: Filamentation of a phase-modulated pulse under conditions of normal, anomalous and zero group velocity dispersion

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. (extreme light fields and their applications)
Authors:
;  [1] ; ; ;  [2]
  1. Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow (Russian Federation)
  2. Department of Physics, M.V. Lomonosov Moscow State University (Russian Federation)
Publication Date:
OSTI Identifier:
22395863
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 44; Journal Issue: 6; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; LASERS; MODULATION; OPTICAL DISPERSION; PULSES; SPECTRA; VELOCITY; WAVE PROPAGATION