Abstract
The influence of cubic crystal orientation on the generation of cross-polarization, self-phase modulation, and laser beam self-focusing is investigated. The orientations at which these effects are maximal and minimal have been found. The qualitative and quantitative difference of these effects in ceramics from those in single crystals and glass has been determined. Random small-scale (of order grain size) spatial modulation of laser beam polarization and phase has been predicted. This effect has no analogs in glasses or in single crystals. It is shown that, from the viewpoint of nonlinear phase incursion average over beam cross-section, ceramics is equivalent to glass whose nonlinearity is determined by a combination of the elements of ceramics tensor χ(3).
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