To acquire high efficiency middle wave infrared(MWIR) laser of 3 μm~5μm,the high repetition rate driving electro-optic Q-switched synchronization technology and LD side-pumped technology were used to get high repetition rate laser output with 1.06 μm narrow width.Periodically poled lithium tantalate (PPLT) was pumped to achieve high-power MWIR laser output of 3 μm ~5 μm.As the input current was 20 A and the Q-switched frequency was 10kHz, the 1.06 μm laser with 15 W power was obtained.After pumping PPLT by the laser, the 3.9 μm laser with maximum power of 2.6 W was got.The conversion efficiency from 1.06 μm to 3.9 μm was 17.3%.Experiment results indicate that the high repetition rate driving e-lectro-optical Q-switched technology and LD side-pumped technology can be used to obtain high-repetition narrow-width 1.06 μm polarized laser, and pumping PPLT can obtain high-power high-efficiency 3.9 μm MWIR laser.%为了获得高效率3 μm～5 μm中红外激光输出,利用电光调Q晶体RbTiOPO4(RTP),通过高重复频率驱动调Q同步技术和LD侧面泵浦技术,获得高重频窄脉宽1.06 μm激光输出,泵浦非线性晶体周期极化钽酸锂(PPLT)进行频率变换,实现高功率3μm～5 μm中红外激光输出.在电源输入电流20 A、调Q驱动频率10 kHz的条件下,获得15W的1.06 μm激光.利用该1.06μm激光泵浦PPLT获得最高功率为2.6W的3.9 μm中红外激光,1.06μm到3.9μm的转化效率为17.3％.实验结果表明:通过高重频电光调Q技术和LD侧面泵浦技术,可以实现高重频窄脉宽1.06 μm偏振光输出,泵浦PPLT可获得高功率高效率3.9 μm中红外激光输出.
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