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By using Gaussian–Hermite-mode expansion, the Raman nonlinear wave equations for the second-order Stokes field generated in the processes of cascade Raman scattering and four-wave mixing are solved for the case of a pump with a focused Gaussian beam. The numerical analysis is made under tight and soft focusing cases, and the calculated results are compared with our recent experiment.
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Cheng et al. (1988) studied this question.
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