报道了一个内腔式连续波、单谐振1.9 μm和2.4 μm双波长激光输出的光参量振荡器(OPO)。实验采用单管半导体激光二极管(LD)抽运掺钕钒酸钇(NdYVO4)晶体，腔内抽运掺氧化镁的周期性极化铌酸锂(PPMgLN)晶体，得到1.9 μm和2.4 μm双波长连续激光输出。在室温下，当LD功率为5.5 W时，同时获得了750 mW、1.9 μm波长的信号光和370 mW、2.4 μm波长的闲频光输出，光光转换效率分别为13.6%和6.7%，总的转换效率达到了20%以上。测试5 h，功率不稳定性小于1.8%。另外还对不同长度的PPMgLN晶体进行了阈值和转换效率的特性分析。通过输出波长稳定性测试发现，对晶体的温度进行更好地控制，可以改善波长漂移的现象。

An intracavity continuous-wave singly resonant optical parametric oscillator (OPO) with wavelengths of 1.9 μm and 2.4 μm is demonstrated. The 1.9 μm and 2.4 μm dual-wavelength continuous lasers are obtained through intracavity pumping the MgO-doped periodically poled LiNbO3 (PPMgLN) and yttrium vanadate (NdYVO4) crystal with a single semiconductor laser diode (LD). 750 mW signal wave at 1.9 μm and 370 mW idler wave at 2.4 μm, are simultaneously obtained when the LD power is 5.5 W at room temperature. The corresponding conversion efficiencies are 13.6% and 6.7% respectively, so the whole efficiency is more than 20%. The output power instability is no more than 1.8% over a measurement period of 5 h. Additionally, the threshold characteristics and conversion efficiency of PPMgLN crystal with different lengths are analyzed. By output wavelength stability test, it is found that better control of the temperature of crystal can improve the phenomenon of wavelength drift.