Multipoint self-focusing of the laser radiation in the optical breakdown plasma
- General Physics Inst., Moscow (Russian Federation)
We have investigated the spatial distribution of the laser radiation scattered by the laser spark. These experiments differ from the previous ones by using of the four harmonics of Nd-laser radiation. As a source of radiation the Nd-laser installation was used with the master oscillator, operated on one transverse and one longitudinal mode. The pulse duration was 10 ns, pulse energy - up to 20 J and divergence of the beam - 8.10-5 rad. After the frequency conversion of the radiation by means of the KDP crystals the 2d, 3d and 4th harmonics radiation appeared with the energy up to 10 J (in 4th harmonic). In all our experiments the radiation was focused by the same quartz lens, its f=lm and f-number f/25. In each our experiment one of laser harmonic radiation was focused into the hermetical chamber, filled with air. Air pressure p could be changed in the range 10 to 760 mm Hg. For the scattered radiation registration we photographed the scattering flat white screen, illuminated by this radiation. This screen was disposed parallel to the laser beam axis at the distance of 2{divided_by}6 mm from it.
- OSTI ID:
- 213015
- Report Number(s):
- CONF-950749--
- Country of Publication:
- United States
- Language:
- English
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