Besides the multiple cascade stimulated Raman scattering, new optical nonlinear phenomena in laser crystal hosts are observed, in particular, in monoclinic KY (WO4)2 and KGd(WO4)2 compounds, under high density visible nano- and picosecond laser excitation in single-pass geometry. The first one is a “laser rainbow”, a multiple co-axial ring Stokes Raman emission by four-wave mixing parametric processes, and the second one is the self-trapping (filamentation) of the propagating laser pump beam and Stokes generation.
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Kaminskii et al. (1995) studied this question.