Abstract

Potassium gadolinium tungstate (KGW) crystals are prospective Raman gain media in the development of solid-state Raman lasers. Especially, the N_p-cut KGW crystal with the maximum Raman gain for the Raman shifts of 768 cm^-1 and 901 cm^-1 are of great importance for generating laser sources, such as watt-level continuous-wave and nanosecond pulsed KGW Raman lasers in spectral range from UV to IR [5]. Therefore, the polarization of Stokes waves is not unique to a Raman shift of the KGW crystal, which is related to the polarization of fundamental waves. To the best of our knowledge, there is no report on the relationship between the fundamental and Stokes wave polarizations in KGW Raman lasers, that is, the incident light and Raman scattering polarizations in KGW crystals.

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