性能稳定可靠的宽调谐光参变振荡器(OPO)是一种非常理想的相干光源，具有最佳的相干性和调谐范围，对于光谱分析、激光干涉计量、遥感、差分吸收雷达等具有重要意义。谐振腔结构、聚焦参数、抽运阈值比、热效应、群速度色散以及其他非线性效应都会影响光参变振荡器的稳定性。详细分析了影响光参变变换稳定性的各种因素，并指出实现单频运转是减弱输出波长噪声最有效的办法。

A stable and reliable optical parametric oscillator (OPO) with the best coherence and tunable spectral range is an ideal laser source. It is widely used in spectrum analysis, laser interference measurement, remote sensing, laser differential absorption radar, etc. The structure of resonant cavity, focusing parameters, pump threshold ratio, thermal effect, group velocity dispersion and other nonlinear effects affect the stability of the OPO system. Various factors which influence the stability of optical parametric transformation are analyzed, the most effective way to eliminate the noise of the OPO system is pointed out, which is the realization of single frequency operation.