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We have demonstrated a high energy, widely tunable, long-wave mid-infrared optical parametric oscillator based on BaGa4Se7 crystal (BaGa4Se7-OPO) which was pumped by an economical wavelength of 1.064μm. The BaGa4Se7-OPO was designed as a double pass single resonant oscillator (DP-SRO), with the advantages of low threshold and high output. The output energy and conversion efficiency of BaGa4Se7-OPO with different cavity lengths were studied theoretically and experimentally. The maximum mid-infrared energy of 611μJ/pulse at 11μm was obtained, and the corresponding optical-to-optical conversion efficiency was 1.53%. A wide tuning range of 8.24-13.3μm was achieved by rotating the BaGa4Se7 crystal and it can be well matched with the theoretical calculation.
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