An attempt is made to check by experiment the assumption that the 2nd order Stokes radiation in collinear direction is generated from the primary light by the same mechanism as the 1st order radiation. If is found that the 1st order Stokes beam does not have a sufficiently high intensity over a sufficiently long interaction lenght to explain the generation of the observed 2nd order Stokes radiation as exclusively attributable to this mechanism. An alternative theory is advanced according to which the molecular vibrations generated in the 1st order Stokes process contribute to this effect in the small-signal range. This allows a more plausible explanation of the experimental results. The experiments were performed with benzene at λ = 0.53 μm because this substance exhibits strong stimulated Raman scattering without selffocusing at this wavelenght.
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