LASER-RADIATION SCATTERING BY THE OPTICAL-BREAKDOWN PLASMA

The spatial distribution measurements of laser radiation, scattered in the laser spark, were accomplished for various laser radiation wave lengths (1960, 530, 353, and 265 nm) and various pressures of the gas (air at 10-760-mm Hg), The interference structure of the laser light scattering cone behind the laser spark was observed for the first time. It is proposed to consider the observed structure as a result of interference of the laser radiation, scattered by two of more self-focusing centers in laser spark air plasma, The experimental dependence of the maximal angle of the light scattering on the gas pressure and on the laser radiation wave length was obtained.