The spatial distribution measurements of laser radiation, scattered in
the laser spark, were accomplished for various laser radiation wave l
engths (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 sc
attering cone behind the laser spark was observed for the first time.
It is proposed to consider the observed structure as a result of inter
ference 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.