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研究了外腔式SrWO4拉曼激光器在ns脉冲抽运下的输出特性。利用主动调Q的Nd∶YAG激光器产生的脉冲宽度为11.7 ns,输出能量为80 mJ的激光作为抽运源,拉曼激光谐振腔采用平平腔,实验采用4片对一阶斯托克斯脉冲和二阶斯托克斯脉冲不同反射率的输出耦合镜,测量了输出能量与抽运能量的关系,计算了转换效率与抽运能量的关系。当输出耦合镜对一阶斯托克斯脉冲的反射率为39.9%时,实验得到一阶斯托克斯脉冲的最大能量和转换效率分别为23.9 mJ和36.2%,当输出耦合镜对一阶斯托克斯脉冲和二阶斯托克斯脉冲的反射率分别为80.5%和12.4%时,得到二阶斯托克斯脉冲的最大输出能量和转换效率分别为16.4 mJ和25.4%,典型的一阶斯托克斯脉冲和二阶斯托克斯脉冲的脉冲宽度分别为6.1 ns和5.8 ns。
The output characteristics of an external cavity SrWO4 Raman laser under ns pulse pumping are investigated. A laser with Nd: YAG laser with active Q-switched Nd: YAG laser of 11.7 ns and an output power of 80 mJ is used as the pumping source. The Raman laser resonator is a flat resonator. Four pairs of first-order Stokes pulses And second order Stokes pulse with different reflectivity of the output coupling mirror, measuring the relationship between the output energy and the pumping energy, calculated the conversion efficiency and pumping energy. When the output coupling mirror has a reflectivity of 39.9% for the first order Stokes pulse, the maximum energy and the conversion efficiency of the first order Stokes pulse are respectively 23.9 mJ and 36.2%. When the output coupling mirror is of the first order When the reflectivities of Stokes pulse and second-order Stokes pulse are 80.5% and 12.4% respectively, the maximum output energy and conversion efficiency of the second-order Stokes pulse are 16.4 mJ and 25.4%, respectively The pulse widths for first-order Stokes and second-order Stokes pulses are 6.1 ns and 5.8 ns, respectively.