Self-focusing of profiled ultrashort-wavelength laser beams in air
- Russian Academy of Sciences, Zuev Institute of Atmospheric Optics, Siberian Branch (Russian Federation)
- Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation)
We report on the results of laboratory experiments of filamentation of sharply focused gigawatt femtosecond laser radiation passed through various aperture diaphragms in air. For the multiple filamentation regime, the dependences of the length and spatial structure of the filamentation region on the initial beam profile are established. It is found that light beam profiling by a diaphragm leads in some cases to a displacement of the filamentation region and to repeated self-focusing of radiation behind the linear focal waist. In the beam of the same power in the absence of a diaphragm and in the regime of the formation of a single filament, this effect terminates in front of the geometrical focus. The experimental results are illustrated by numerical simulation data.
- OSTI ID:
- 22156354
- Journal Information:
- Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 2 Vol. 116; ISSN JTPHES; ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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