Abstract
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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Cotter, D., Hanna, D.C. & Wyatt, R. Infrared stimulated Raman generation: Effects of gain focussing on threshold and tuning behaviour. Appl. Phys. 8, 333–340 (1975). https://doi.org/10.1007/BF00898367
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DOI: https://doi.org/10.1007/BF00898367