Theory of coherent Raman mixing in an intense pump field /the six-wave model/

The theory of coherent Raman mixing is generalized to the case of an intense pump field, where the anti-Stokes component, arising in stimulated Raman scattering of the pump, is significant. It is shown that the appearance of the anti-Stokes component produces an increase in the area of the spatial distribution of molecular oscillations, which in turn produces an increase in the generation efficiency of infrared radiation. Theoretical results obtained with the six-wave model are compared with experimental data on the generation of infrared radiation.