External resonator YVO_4 crystal Raman laser

In order to obtain new wavelengths and high efficient laser outputs,an external resonator Raman experimental setup was established and the properties of YVO4 crystals were measured.Then,a high optical quality YVO4 crystal with the largest size of 28 mm×40 mm and a mass of 126 g was grown by Czochralski pulling method.The Raman output properties of YVO4 crystals in the external resonator were researched using a mode-locked Nd:YAG laser with a pulse width of 40 ps as the pump source.The results indicate that the total conversion efficiency for multi-wavelength output has reached 51.4%,and the largest output energy is 2.21 mJ.Moreover,the highest conversion efficiency for the first Stocks Raman output at 1 175 nm is 32%,and the largest output energy is 0.57 mJ.The conversion efficiency for the second Stocks Raman output at 1 313 nm is 12.3%,and the largest output energy is 0.36 mJ.These results reported here show that the external resonator structure can improve the Raman performance of YVO4 crystals evidently.