Laser control of filament-induced shock wave in water

We discovered that tight focusing of Cr:forsterite femtosecond laser radiation in water provides the unique opportunity of long filament generation. The filament becomes a source of numerous spherical shock waves whose radius tends to saturate with the increase of energy. These overlapping waves cre...

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Bibliographic Details
Published in:Laser physics letters 2014-10, Vol.11 (10), p.106001
Main Authors: Potemkin, F V, Mareev, E I, Podshivalov, A A, Gordienko, V M
Format: Article
Language:English
Subjects:
aberrations
femtosecond filament
laser-induced shock waves
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Summary:We discovered that tight focusing of Cr:forsterite femtosecond laser radiation in water provides the unique opportunity of long filament generation. The filament becomes a source of numerous spherical shock waves whose radius tends to saturate with the increase of energy. These overlapping waves create a contrast cylindrical shock wave. The laser-induced shock wave parameters such as shape, amplitude and speed can be effectively controlled by varying energy and focusing geometry of the femtosecond pulse. Aberrations added to the optical scheme lead to multiple dotted plasma sources for shock wave formation, spaced along the optical axis. Increasing the laser energy launches filaments at each dot that enhance the length of the entire filament and as a result, the shock impact on the material.
ISSN:1612-2011
1612-202X
DOI:10.1088/1612-2011/11/10/106001