Cotter, D., Hanna, D.C. and Wyatt, R.
Infra-red stimulated Raman generation effects of gain focusing on threshold and tuning behaviour
Applied Physics B: Lasers and Optics, 8, (4), . (doi:10.1007/BF00898367).
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It is shown that for generation of infrared radiation by stimulated Raman scattering, the diffraction spread of the Stokes wave can have a significant effect on the threshold. Compared with an analysis in which gain focussing is neglected, the threshold powers may be much higher with a corresponding reduction in tuning range. The design of a Raman oscillator is considerably influenced by these diffraction effects, and also it is found that the Stokes wave is subject to frequency-pulling which is dependent on the pump power.
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