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We have demonstrated a high-pulse-energy nanosecond mid-infrared optical parametric oscillator (OPO) based on the nonlinear crystal BaGa4Se7 pumped by 1.064 µm Nd:YAG laser. The experimental OPO threshold of 7.97 MW/cm2 was in good agreement with the theoretical calculation of 8.05 MW/cm2. The maximum pulse energy of the idler wavelength was 2.56 mJ at 4.11 µm wavelength when the pump energy was 61...
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