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报道了采用LD端面抽运的BaWO4晶体内腔式连续拉曼激光器和复合YVO4晶体连续自拉曼激光器的实验研究。考虑了激光晶体的热效应,采用等效G参数法计算了谐振腔内的腔模参数,从谐振腔结构、泵浦光斑大小以及晶体的选择方面对激光器系统进行了优化设计,对不同腔结构的全固态连续拉曼激光器的性能进行了研究。选用拉曼增益高、热性能较好的BaWO4晶体作为拉曼介质,实现了LD端面泵浦Nd:YVO4/BaWO4内腔式、低阈值、高效率和高功率的拉曼激光在1 180nm的连续运转。在25.5 W的泵浦功率下,获得了3.36W的1 180nm连续拉曼光输出,光光转换效率为13.2%,斜效率为15.3%,拉曼阈值为3.6 W。通过选用复合晶体作为自拉曼介质使连续拉曼激光器的热效应显著改善,实现了LD端面泵浦连续自拉曼激光器在1 175nm的高效运转。在25.5W的泵浦功率下,获得了最高3.4W的1 175nm连续拉曼光输出,光-光转换效率为13.3%,拉曼阈值降低至2.21W,斜效率为14.6%。
The experimental study on the continuous cavity Raman laser with BaWO4 crystal and the YVO4 crystal continuous self-Raman laser using the LPS end-pumped were reported. Considering the thermal effect of the laser crystal, the cavity mode parameters in the cavity were calculated by the equivalent G-parameter method. The laser system was optimized from the aspects of resonator structure, pump spot size and crystal selection. All-solid-state continuous Raman lasers have been studied. The BaWO4 crystal with high Raman gain and good thermal performance is selected as the Raman medium to achieve a continuous LD at a wavelength of 180 nm for an LD end-pumped Nd: YVO4 / BaWO4 luminosity, low threshold, high efficiency and high power Raman laser Run. At a pumping power of 25.5 W, a 1. 180W continuous Raman light output of 3.36W was obtained with a light conversion efficiency of 13.2%, an oblique efficiency of 15.3% and a Raman threshold of 3.6W. The thermal effect of the continuous Raman laser is improved significantly by using the composite crystal as the Raman medium, and the LD end-pumped continuous self-Raman laser operates efficiently at 1 175 nm. At a pump power of 25.5W, a maximum Raman intensity of 1 175 nm was obtained at 3.4W with an optical-to-optical conversion efficiency of 13.3% and a Raman threshold of 2.21W with a ramp efficiency of 14.6%.