Stimulated rotational and vibrational Raman scattering by elliptical polarized pump radiation

Stimulated rotational and vibrational Raman scattering is investigated with a XeCl excimer laser by varying either the ellipticity degree of the pump radiation polarization and the pump beam quality factor (M-2) and divergence (theta). It is shown that the dependence of stimulated rotational Raman scattering upon pump radiation polarization is substantially influenced by the optical properties (M-2 and theta) of the pump beam. Gain suppression effects on stimulated vibrational Raman scattering and their dependence on pump beam optical properties have been evaluated to support experimental results. Introducing the effective vibrational Raman gain provides a good understanding of the experimental results.