Stimulated Brillouin scattering is investigated here under conditions characterized by high optical pump intensity. Calculations are carried out at 1.3 and 3.8 /jm with pump intensities equal to approximately three times the threshold. Such strong optical forcing leads to significant self-distortion of the density profile in the material wave serving as the optical grating. The method of multiple scales is used to find a uniform asymptotic expansion in the coupling. At the first perturbation level the resonant portion of the problem yields abridged equations for the incident and the scattered waves with frequencies CWaLn d ws = L - 0 and for the grating and its harmonics with frequencies nfl. The nonresonant portion of the first perturbation yields field components with the frequencies WL + nfl and cos - nfl for n = 1, 2,.... Numerical solutions of the truncated abridged system are found by a method of Chebychev collocation and indicate a reduction in the observed phonon lifetime and a broadening of the linewidth with increasing amplitude.
Optical Society of America
Journal of the Optical Society of America B
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Journal of the Optical Society of America B, 11(8): 1367-1373