Experimental study demonstrates a compact ring-cavity BGSe optical parametric oscillator achieving 1.2 mJ pulses at 8.5 μm, indicating improved beam quality for far-field monitoring.
Existing long-wave infrared (LWIR) BaGa4Se7 optical parametric oscillators (BGSe-OPOs) adopt linear-cavity configurations yet struggle to balance high beam quality and high output energy. To overcome this limitation, we report a compact Type I phase-matched ring cavity BGSe-OPO pumped by a 1.06 μm laser. Operating at 8.5 μm, the OPO generates 1.2 mJ single pulses with a peak power of 0.25 MW and an optical-to-optical conversion efficiency of 2%. The estimated beam quality factor M2 is 9, representing a threefold enhancement relative to linear-cavity under identical pump conditions. The system features a compact footprint of 400 × 200 mm2 and a far-field divergence angle of 4 mrad after 6× beam expansion, enabling practical applications in far-field monitoring.
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Li et al. (2026) studied this question.
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