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6A2 - The influence of self-focusing on the stimulated Brillouin, Raman, and Rayleigh effects

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3 Author(s)
Bloembergen, N. ; Harvard Univ., Cambridge, MA, USA ; Lallemand, P. ; Pine, A.

In liquids with optically anisotropic molecules the largest nonlinear polarization, cubic in the field amplitudes, corresponds to the intensity dependent index of refraction. The resulting self-focusing of the laser beam is in turn responsible for the anomalous gain of the stimulated Raman emission. The stimulated Brillouin effect in these self-focusing fluids has the same threshold condition as the stimulated Raman effect. In both cases the condition is that self-focusing occurs within the cell length. The anomalous frequency broadening in these same liquids depends on the parameter (\omega _{L} - \omega '_{L})\tau _{c} , where ωLand \omega '_{L} are two frequencies occurring in the laser beam and τcis a correlation time for molecular reorientation. In agreement with this theory, more broadening was observed at higher temperatures, although the Raman gain has the opposite trend.

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Quantum Electronics, IEEE Journal of  (Volume:2 ,  Issue: 8 )