We report on efficient midinfrared difference-frequency generation (DFG) in orientation-patterned GaAs by intracavity mixing the signal and idler pulses of a narrowband nanosecond optical parametric oscillator based on periodically poled ${\rm{LiNb}}{{\rm{O}}_3}$. The maximum average DFG output power reached 215 mW at 8.15 µm for a repetition rate of 35 kHz. The temperature tuning range spanned over 8026–8710 nm. The maximum overall conversion efficiency from 1 to 8 µm amounted to ${\sim}{1.3}\%$.

中文翻译：

---

定向模式GaAs中红外腔内差频混合纳秒光学参量振荡器

我们报告了通过腔内混合基于周期极化的$ {\ rm {LiNb}} {{\ rm {O }} _ 3} $。DFG的最大平均输出功率在8.15 µm时达到215 mW，重复频率为35 kHz。温度调节范围跨越8026–8710 nm。从1到8 µm的最大总转换效率为$ {\ sim} {1.3} \％$。