Abstract
Abstract
We report on the numerical investigation of spectral enrichment under mid-infrared (4.4 μm) laser filamentation in CaF2 and the influence of the external focusing on this nonlinear phenomenon. It is shown that the supercontinuum generation is related to the rapid free-electron increase and appears when nonlinear and diffraction lengths are practically the same. With further pulse propagation, the anti-Stokes wing (ASW) is formed which is caused by the pulse splitting. Looser focusing leads to pulse splitting be closer to the point of supercontinuum formation along the propagation axis. The ASW experiences a red-shift when external focusing is applied due to increased free-electron density.
Funder
Russian Foundation for Basic Research
Foundation for the Advancement of Theoretical Physics and Mathematics
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
4 articles.
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