Applied physics
N 1, 2003

Non-uniformities of optical discharges generated by the wave beam with Rayleigh divergence compensated

L. N. Pyatnitsky
Institute for High Temperatures, RAS, Moscow, Russia

   Wave beam Rayleigh divergency can be compensated. Laser sparks generated within such kind of the beams have some typical configurations which depend on the wave field structure. The field radial profile takes shape of Bessel function. The field longitudinal contour is formed as a result of the wave nonlinear interaction. The heating pulse duration being longer 1 ns induces propagation process of the first microdischarges, that influences greatly the spark configuration, similar Gauss beams. However, the discharge leading points move by leaps, and inclination angle of their tracks is found to be much more steeper than the one of the heating radiation rays direction of their tracks is found to differ violently from the one of the heating radiation rays.

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