We have demonstrated wideband tunable optical parametric oscillator (OPO) based on BaGa4Se7 crystal. A pump doublepass, short cavity, singly resonant OPO configuration was used to improve the optical conversion efficiency and reduce the OPO threshold. Using a commercial nanosecond laser with a repetition rate of 10 Hz as the pump source, the tuning range of BaGa4Se7-OPO achieved 3.10-4.84 and 8.24-13.34 µm in mid-wave and long-wave infrared band respectively. The maximum single pulse energy of reached 8.55 mJ at 3.88 µm and 0.855 mJ at 10.8 μm. To achieve high repetition rate operating, an electro-optic Q-switched laser with repetition rate of 1 kHz was built. The high repetition rate BaGa4Se7- OPO have a maximum output power of 564 mW at 3.87 μm and a tuning range of 2.99-5.04 µm.
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