【摘要】 为研究百纳秒脉宽光参量振荡器的中红外波段闲频光输出特性，首先理论分析基频光输出参量和谐振腔长度对输出闲频光脉冲宽度的影响，然后通过实验研究不同脉宽下激光器的振荡阈值和转换效率的变化以及激光器的最优运行参量。对百纳秒脉宽MgO∶PPLN光参量振荡中红外激光器的实验研究结果表明：以百纳秒脉冲宽度的Nd∶YAG固体激光器为基频光泵浦源，在PPLN晶体温度为25℃、基频光能量为29～34 mJ时，达到最佳超阈值倍数；通过温度调谐及改变谐振腔长度，获得波长调谐范围为3.17～3.33μm、脉宽可调范围为74.05～113.5 ns、中心波长为3.33μm的中红外激光输出，最高转换效率为7.9%。更多还原

【Abstract】 To study the output characteristics of idler light in the mid-infrared by hundred-nanosecond pulse width optical parametric oscillator(OPO),firstly, theoretical analysis is conducted on the influence of fundamental light output parameters and cavity length on the pulse width of idler light.Then, by experiment, the changes in the oscillation threshold and conversion efficiency of the laser under different pulse widths, as well as the optimal parameters of the laser, are studied.The research on the hundred-nanosecond pulse width MgO∶PPLN OPO mid-infrared laser has showed: using the Nd∶YAG solid-state laser with hundred-nanosecond pulse width as the fundamental light pump source at 25 ℃of PPLN and the fundamental light power stage of 29～34 mJ,the pump reaches optimal over-threshold multiple.By temperature tuning and changing the length of the resonant cavity, a mid-infrared laser output with a wavelength tuning range of 3.17～3.33 μm, a pulse width adjustable range of 74.05～113.5 ns, and a center wavelength of 3.33 μm was obtained, with a maximum conversion efficiency of 7.9%.更多还原