光纤激光泵浦外腔MgO:PPLN高效率3.4μm光参量振荡器研究

Study on High Efficiency 3.4 μm Optical Parametric Oscillation based on External Cavity MgO:PPLN Pumped by Fiber Laser

选用1 065 nm掺镱光纤激光泵浦外腔MgO:PPLN光参量振荡(OPO),实现高功率3.4μm中红外激光输出。以高稳定性的分布式反馈激光器(DFB)作为光纤激光脉冲的种子源以降低泵浦光光谱展宽。实验中,采用双路光纤激光泵浦MgO:PPLN-OPO,实验研究发现重频、脉宽的最佳匹配对系统的参量光功率提升有着显著的正向影响。在泵浦功率为25.03 W、重复频率100 kHz、脉宽200 ns条件下,获得最大输出功率为3.536 W的3.44μm的激光输出。对应脉冲宽度为128 ns,光光转换效率为14.12%。

A high conversion efficiency 3.44 μm optical parametric oscillation has been achieved through the MgO:PPLNOPO pumped by 1 065 nm ytterbium-doped fiber laser is reported.The high stability distributed feedback laser(DFB)is used as the seed source of fiber laser pulse to reduce the pump spectral broadening.In the experiment,two fiber laser pumping sources were used to pump MgO:PPLN-OPO.It is found that the optimal combination of repetition frequency and pulse width has a significant positive effect on the parametric optical power of the system.The 3.536 W of laser output power with a conversion efficiency of 14.12% with 3.44 μm is obtained,under the condition of 25.03 W of the pump power,the repetition rate is 100 kHz and the pulse width is 200 ns.