采用腔外单次通过方式, 实现了BaWO4晶体的高效受激拉曼散射(SRS)。当抽运光为532 nm皮秒激光脉冲时获得了5级斯托克斯线(559.64 nm,590.26 nm,624.42 nm,662.76 nm,706.18 nm)和3级反斯托克斯线(463.42 nm,484.24 nm,507.04 nm), 测量了BaWO4晶体各级拉曼散射谱线的阈值和增益系数, 受激拉曼散射的整体转换效率高达78%。当抽运光为355 nm皮秒激光脉冲时观察到3级斯托克斯线(366.52 nm, 379.40 nm, 393.22 nm), 根据一级斯托克斯线的抽运阈值得到相应的拉曼增益为51.8±2.7 cm/GW。实验表明BaWO4晶体具有易生长、透光波段宽、抗光损伤能力强、增益系数大等优点, 有望在全波段可见激光的产生方面获得重要应用。

High efficiency stimulated Raman scattering (SRS) of BaWO4 crystal was realized by an ultra-cavity single-pass configuration. When the pump source is 532 nm picosecond laser, five Stokes lines (559.64 nm, 590.26 nm, 624.42 nm, 662.76 nm, 706.18 nm) and three anti-Stokes lines (463.42 nm, 484.24 nm, 507.04 nm) are observed. The SRS thresholds and Raman gain coefficients for different scattering lines are measured, and the total conversion efficiency reaches 78%. When the pump source is 355 nm picosecond laser, three Stokes lines (366.52 nm, 379.40 nm, 393.22 nm) are observed, and according to the pump threshold of the first Stokes line the Raman gain is obtained as 51.8±2.7 cm/GW. Experiments have shown that BaWO4 crystal possesses advantages of easy growth, wide transmittance spectrum, high optical damage threshold, and large gain coefficient, which indicates this material will have important applications in generation of whole wave-band visible lasers.