光纤激光泵浦PPMgLN高效率2.70 μm光参量振荡器研究

Research on High-Efficiency 2.70 μm Optical Parametric Oscillator Pumped by Fiber Laser Based on PPMgLN

摘要: 报道了一种1.06 μm掺镱光纤激光泵浦PPMgLN光参量振荡器(Optical Parametric Oscillator)，实现高转换率的2.70 μm中红外激光输出。在泵浦注入功率为14.7 W、重复频率110 kHz、脉宽60 ns的条件下，获得最大输出功率为3.4 W的2.70 μm激光输出。对应脉冲宽度为55.39 ns，光–光转换效率为22.8%。2.70 μm闲频光光束质量因子$M_x^2$ 和$M_y^2$ 分别为1.41和1.42，其光斑模式接近基模。此外，控制晶体温度在30~90℃变化，实现了闲频光波长在2.692~2.493 μm范围内调谐。

Abstract: An optical parametric oscillator (OPO) pumped by a 1.06 μm Yb-doped fiber laser based on a periodically poled MgO-doped lithium niobite (PPMgLN) is reported for high-efficiency 2.70 μm mid-infrared laser output. Under the condition of a pump injection power of 14.7 W, a repetition rate of 110 kHz, and a pulse width of 60 ns, a maximum output power of 3.4 W of 2.70 μm laser output is achieved. The corresponding pulse width is 55.39 ns, with an optical-to-optical conversion efficiency of 22.8%. The beam quality factors $M_x^2$ and $M_y^2$ of the 2.70 μm idler light are 1.41 and 1.42, respectively. The laser beam quality closely approaches the theoretical quality of the fundamental mode beam. Moreover, by controlling the crystal temperature in the range of 30~90˚C, a wavelength tuning range of idler light from 2.692 to 2.493 μm is achieved.