Beginning from the third-order nonlinear polarization from the stimulation and induction of matter based on the semiclassical theory of stimulated Raman scattering (SRS), a theoretical model of coupling between the phase of a pump (transmission) laser beam and the phase of the Stokes beam intensity is established for the case of stimulated Raman scattering during long-path propagation of a high-power laser. The model clearly explains how the SRS effect influences ...