Yu. E. Geints, A. A. Zemlyanov, A. A. Ionin, D. V. Mokrousova, L. V. Seleznev, D. V. Sinitsyn, E. S. Sunchugasheva, “Comparative analysis of post-focal filamentation of focused UV and IR laser pulses in air”, Kvantovaya Elektronika, 2015, Volume 45, Number 4,Pages <nobr>321

This article is cited in 8 papers

Nonlinear optical phenomena

Comparative analysis of post-focal filamentation of focused UV and IR laser pulses in air

Yu. E. Geints^a, A. A. Zemlyanov^a, A. A. Ionin^b, D. V. Mokrousova^bc, L. V. Seleznev^b, D. V. Sinitsyn^b, E. S. Sunchugasheva^bc

^a Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Science, Tomsk
^b P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
^c Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow region

Abstract: We report the results of laboratory experiments and numerical calculations of the spatial position and structure of a plasma channel produced in air by high-power focused femtosecond laser radiation with wavelengths of 740 and 248 nm as a result of its self-focusing and filamentation. A comparative analysis of the physical patterns of filamentation of IR and UV laser beams with variations in the beam focal length, transverse size and power is performed. It is found that a plasma channel beyond the linear focal waist of the laser beam is formed differently for two different spectral ranges.

Keywords: ultrashort laser radiation, focusing, self-focusing, filamentation.

PACS: 42.65.Jx, 42.65.Re

Received: 23.07.2014
Revised: 16.09.2014