报道了一种高效率的2μm光学参量振荡器.利用1.064μm声光调Q Nd:YVO4激光器抽运基于氧化镁掺杂周期性极化铌酸锂的内腔式光学参量振荡器,在简并状态实现了稳定高效的2μm激光输出.当808 nm激光二极管抽运功率为20 W,Q开关工作频率为15 k Hz时,产生了平均功率为3.5 W、脉冲宽度为1.4 ns的2μm激光,光-光转换效率为17.5%,斜效率为25%.据我们所知,该转换效率在2μm波段内腔式光学参量振荡器中是最高的. A high efficiency 2μm optical parametric oscillator is reported.A cavity optical parametric oscillator based on MgO doped periodically poled lithium niobate is pumped by a 1.064μm acousto-optic Q-switched Nd: YVO4 laser, State stable and efficient 2-μm laser output with a 2-μm laser with an average power of 3.5 W and a pulse width of 1.4 ns when the 808 nm laser diode pumping power is 20 W and the Q-switching operating frequency is 15 kHz - The light conversion efficiency is 17.5% and the ramp efficiency is 25%. To the best of our knowledge, this conversion efficiency is highest in the 2μm band cavity optical parametric oscillator.