Abstract
Transverse pattern formation along the propagation in Kerractive CS2 of a circularly and an elliptically apertured high-intensity input beam is studied. Observation is made of the modification in the Fresnel diffraction pattern as a function of the input beam power and the propagation distance. In addition to the well defined ring patterns, at high powers these rings break up into several spots. Also, a thermal-induced nonlinearity was observed to affect the dynamics of the pattern formation. Both forward stimulated Raman scattering (SRS) and backward stimulated Brillouin scattering were observed to occur during the propagation of the beam along the CS2 cell. An unexpected pattern of fringes was always observed in the Stokes components of the SRS.
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