We analyze operating characteristics of CW intracavity singly-resonant optical parametric oscillator( ICSRO) theoretically. Furthermore, using the quasi-phase-matched periodically poled MgO-doped lithium niobate crystal (PPMgLN)as the nonlinear converter,we have accomplished low threshold and highly efficient ICSRO,driven by compact and efficient diode-end-pumped CW Nd:YVO4 laser. The threshold of ICSRO system is only 3.1 W at 808 nm. A maximum idle output power of 370 mW and a maximum signal output power of 540 mW have been achieved when the pump power is 5 W and it corresponds to a whole optic-optic conversion efficiency of 18.2%.%在理论上对内腔连续单谐振光学参量振荡器(ICSRO)的运转特性进行了简要的分析,并在实验采用LD泵浦的连续Nd:YVO4激光器作为泵浦源,实现了PPMgLN晶体准相位匹配,获得了低阈值高效率ICSRO.光学参量器的阈值仅为3.1 W(808 nm)；在泵浦光5W时,获得了370 mW连续中红外激光输出,540 mW信号光输出,总的光光转化效率达到18.2％.
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