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报道了一台高单脉冲能量的光参量振荡(OPO)2μm固体激光器。采用电光调Q,Nd∶YAG激光器输出的1064 nm激光,抽运腔内两块光轴方向相向放置的KTP晶体,通过双谐振光参量振荡(DROPO)技术获得2μm激光输出。OPO谐振腔由2μm反射镜、两块走离补偿的KTP晶体和2μm输出镜组成。KTP晶体尺寸为8 mm×8 mm×15 mm,切割角θ=53°,φ=0°。OPO采用Ⅱ类相位匹配(o→o+e)。当激光二极管单脉冲能量为1.02 J,电光Q开关频率为30 Hz时,获得了单脉冲能量107 mJ的简并波长2.1μm激光输出,808 nm激光二极管到2.1μm光光转换效率为10.5%,光束质量因子分别为M2x=2.38,M2y=1.56。
A high monopulse energy optical parametric oscillator (OPO) 2μm solid-state laser is reported. A KTP crystal with two optical axes in the cavity was pumped by a 1064 nm laser output from an electro-optic Q-switched Nd: YAG laser. The 2 μm laser output was obtained by double-resonance optical parametric oscillation (DROPO). The OPO resonator consists of a 2 μm mirror, two offset KTP crystals and a 2 μm output mirror. KTP crystal size of 8 mm × 8 mm × 15 mm, cutting angle θ = 53 °, φ = 0 °. OPO uses class II phase matching (o → o + e). When the single pulse energy of laser diode is 1.02 J and the switching frequency of electro-optic Q switch is 30 Hz, the laser output of degenerate wavelength 2.1 μm with a single pulse energy of 107 mJ is obtained. The light-to-light conversion efficiency from the 808 nm laser diode to 2.1 μm is 10.5% The beam quality factors are respectively M2x = 2.38 and M2y = 1.56.