Propagation of the wave of Stimulated Raman Scattering (SRS) in waveguide is studied, on conditions that it is filled with some Raman-active material and that a pump wave is present inside. The features of the SRS-wave are analyzed, assuming the wave frequency to be close to the critical value.
Tatiana I. Kuznetsova,
"Stimulated Raman scattering in waveguides of subwavelength radius", Proc. SPIE 4069, Raman Scattering, (18 February 2000); doi: 10.1117/12.378114; https://doi.org/10.1117/12.378114