Filamentation of an annular laser beam with a vortex phase dislocation in fused silicaстатья
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Дата последнего поиска статьи во внешних источниках: 17 октября 2017 г.
Аннотация:The filamentation of a femtosecond laser pulse in fused
silica has been numerically investigated for the case of an annular
beam with a phase singularity at a wavelength of 800 nm. The spatiotemporal
propagation dynamics of the pulse and the transformation
of its frequency-angular spectra are analysed. It is shown that
a tubular structure with a radius of 3 – 4 mm, peak intensity of about
2.4 ´ 1013 W cm–2, and maximum plasma density on the order of
1020 cm–3 is formed in the nonlinear focus; the length of this structure
significantly exceeds the waist length in the linear case. The
results of the analysis are compared with the data obtained for an
annular beam free of phase dislocations and for a Gaussian beam.