We demonstrated a 11.6 W middle infrared ZnGeP 2 (ZGP) optical parametric amplifier (OPA), which was pumped by a 2090.7 nm Q-switched Ho:YAG laser with a pulse repetition frequency of 1 kHz. The output power of 2.2 W produced by a ZGP optical parametric oscillator (OPO) served as seed and the whole pump power of ZGP OPA with ZGP OPO was 24 W, corresponding to an optical-to-optical conversion efficiency of 48.3% from the Ho to the middle infrared. At the maximum output level, the beam quality factors M 2 of the middle infrared ZGP OPA were 2.2 and 2.4 for horizontal and vertical directions, respectively. The linewidths (FWHM) of the middle infrared ZGP OPA spectrum were about 172 nm and 121 nm for the signal and idler with a central wavelength of 3.85 μ m and 4.58 μ m, respectively.

中文翻译：

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具有1 kHz重复频率的11.6 W中红外ZnGeP 2光学参量放大器系统

我们展示了一个11.6 W中红外ZnGeP 2（ZGP）光学参量放大器（OPA），它由2090.7 nm调Q的Ho：YAG激光器泵浦，脉冲重复频率为1 kHz。由ZGP光学参量振荡器（OPO）产生的2.2 W输出功率用作种子，带有ZGP OPO的ZGP OPA的整个泵浦功率为24 W，对应于Ho的光光转换效率为48.3％到中红外。在最大输出水平下，中红外ZGP OPA的光束质量因子M 2在水平和垂直方向上分别为2.2和2.4。对于中心波长为3.85μm和4.58μm的信号和惰轮，中红外ZGP OPA光谱的线宽（FWHM）分别约为172 nm和121 nm。