CAJ | 학술논문

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 kHz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.
보도료일충고효솔적2μm광학삼량진탕기.이용1.064μm성광조Q Nd：YVO4격광기추운기우양화미참잡주기성겁화니산리적내강식광학삼량진탕기,재간병상태실현료은정고효적2μm격광수출.당808 nm격광이겁관추운공솔위20 W, Q개관공작빈솔위15 kHz시,산생료평균공솔위3.5 W、맥충관도위1.4 ns적2μm격광,광-광전환효솔위17.5%,사효솔위25%.거아문소지,해전환효솔재2μm파단내강식광학삼량진탕기중시최고적.
A high-e?ciency 2 μm optical parametric oscillator based on MgO-doped periodically poled LiNbO3 intracavity pumped by a 1.064 μm Q-switched Nd:YVO4 laser is reported. With the intense fluence inside the laser cavity, a maximum 2 μm average power of 3.5 W is obtained at 15 kHz repetition rate in a degenerate state. A maximum optical-to-optical conversion e?ciency of 17.5%with a slope e?ciency of 25%is achieved when the laser diode power is 20 W. To the best of our knowledge, the e?ciency is the highest ever achieved from an intracavity degenerate optical parametric oscillator in 2 μm region. The pulse duration of 2 μm is 1.4 ns, which is much shorter than that of 1.064 μm. A bandwidth of 30 nm is obtained at a degenerate wavelength of 2128 nm. The M 2 values for the 2 μm beam are 3.47 and 3.54 in the horizontal and vertical directions, respectively. The standard deviation of the power fluctuation is～2%at the maximum power in half an hour.