Abstract
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 ${\sim}{1.3}\%$.
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