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报道了一种基于Nd∶YVO4/MgO∶PPLN的高效连续单谐振连续中红外光学参量器.采用LD泵浦的输出波长为1 064nm的连续Nd∶YVO4激光器作为入射光,经过MgO∶PPLN晶体进行非线性频率转换.理论分析了非线性晶体的周期、温度对光学参量振荡量输出波长的影响.提出采用紧凑的平平腔结构,利用多周期的MgO∶PPLN晶体(29.52～31.59μm),产生宽带可调谐的中红外激光,其信号光调谐范围为1.48～1.63μm;闲频光调谐范围为3.0～3.8μm.结果表明:在MgO∶PPLN的极化周期为30.5μm,温度为100℃的条件下,当808nm泵浦光功率为8.06W时,获得最高760mW的信号光和360mW的闲频光输出,对应光光转换效率为13.9%.
An efficient continuous single-resonant continuous mid-infrared optical parametric instrument based on Nd: YVO4 / MgO: PPLN was reported. The LD pumped continuous Nd: YVO4 laser with an output wavelength of 1 064 nm was used as the incident light and passed through the MgO: PPLN crystal Nonlinear frequency conversion.The influence of the period and temperature of nonlinear crystals on the output wavelength of optical parametric oscillation is theoretically analyzed.The compact and flat cavity structure is proposed to use the multi-period MgO: PPLN crystal (29.52 ~ 31.59μm) Tunable mid-infrared laser, the tuning range of signal light is 1.48 ~ 1.63μm and the idle tuning range is 3.0 ~ 3.8μm.The results show that when the polarization period of MgO: PPLN is 30.5μm and the temperature is 100 ℃ , When the 808nm pump power is 8.06W, the maximum 760mW signal light and 360mW idler light output are obtained, and the corresponding light-to-light conversion efficiency is 13.9%.