【摘要】 研究了SrWO₄晶体在外置谐振腔条件下对于皮秒激发脉冲的受激拉曼散射特性。采用提拉法生长了高光学质量的SrWO₄晶体,尺寸为φ22 mm×40 mm,质量为72.3 g。利用分光光度计测量了SrWO₄晶体的室温透过光谱,其透过短波限为260 nm,长波限大于3200 nm,因此可在较宽波长范围内实现拉曼激光频移。当激发源为脉宽40 ps的Nd:YAG锁模激光时,多波长拉曼输出的总转换效率达到73%,最大输出能量2.58 mJ;1180 nm一级斯托克斯拉曼输出的最高转换效率为38%,最大输出能量1.04 mJ;1324 nm二级斯托克斯拉曼输出的最高转换效率为19.3%,最大输出能量0.39 mJ。实验表明,SrWO₄晶体具有易生长、透光波段宽、增益系数大、转换效率高等优点,是一种有实际应用前景的固体拉曼介质。更多还原

【Abstract】 External resonator stimulated Raman scattering of SrWO₄ crystal excited by pico-second pulses is studied. SrWO₄ crystal with high optical quality is prepared by Czochralski pulling method.Its size reachesφ22 mm×40 mm, and its weight is 72.3 g.The transmission spectrum of SrWO₄ crystal is detected by spectrophotometer,which showes its short-wave limit is 260 nm,and long-wave limit is larger than 3200 nm.It indicates that SrWO₄ crystal can realize Raman frequency shifting in a wide wave band.When the exciting source is a 40 ps Nd:YAG mode-locked laser,the total conversion efficiency for multi-wavelengths Raman output reaches 73%,and the largest output energy is 2.58 mJ.The highest conversion efficiency for the first Stocks Raman output of 1180 nm is 38%,and the largest output energy is 1.04 mJ.The conversion efficiency for the second Stocks Raman output of 1324 nm is 19.3%,and the largest output energy is 0.39 mJ.The experimental results show that SrWO₄ crystal possesses many advantages such as easy growth,wide transmittion spectrum,large gain coefficient,and high conversion efficiency, which indicate that SrWO₄ is a promising solid Raman medium that may have practical applications.更多还原