An efficient control of ultrashort laser filament location in air for the purpose of remote sensing

Details An efficient control of ultrashort laser filament location in air for the purpose of remote sensing An efficient control of ultrashort laser filament location in air for the purpose of remote sensing

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apphb..85...55l&link_type=abstract

Applied Physics B, Volume 85, Issue 1, pp.55-58

Physics

22

Scientific paper

The unavoidable hot spots in a practical terawatt level laser pulse will self-focus in air at a short distance. The short distance cannot be changed significantly by only controlling the chirp or divergence. We overcome such early self-focusing by using a telescope, which enlarges the diameter of the beam, thus that of the hot spots. The telescope’s effective focal length is much shorter than the self-focusing distance of both the enlarged beam and the hot spots. Then, the resulting filaments merge into the geometrical focus whose position is controllable by the telescope. This technique also minimizes the generation of white light.

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