Ultra-violet Stimulated Raman Scattering of SrWO_4 Crystal

SrWO4 crystal with high optical quality was grown by Czochralski pulling method.The crystal sizes reached 22mm×40mm,and the weight was 72.3g.The transmittance range of SrWO4 crystal was measured to be 263-3200nm.By the single-pass configuration,ultra-violet stimulated Raman scattering(SRS) of SrWO4 crystal was realized.When the pump source was a 355nm pico-seconds laser,three Stokes lines(366.44,379.25,392.98nm)were obtained.The pump threshold of the first Stokes line was only 169.76MW/cm2,and the corresponding Raman gain was 49.09cm/GW.The results show that SrWO4 crystal possesses many advantages such as wide transmittance spectrum,high optical damage threshold,low Raman pump threshold,and large gain coefficient,so the material will have good applications in Raman frequency shifting of ultra-violet laser.