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Opt Express. 2019 Feb 18;27(4):4014-4023. doi: 10.1364/OE.27.004014.

Continuous-wave difference-frequency generation based on BaGa4Se7 crystal.


A continuous-wave mid-infrared radiation from difference frequency generation by mixing a continuous-wave Ti: sapphire laser and a continuous-wave YAG laser in a 15 mm long BaGa4Se7 crystal is demonstrated for the first time. The tunable range from 3.15 to 7.92 μm was achieved by rotating the crystal to fulfill the type I phase-matching condition. A maximum DFG power of 1.41 μW was obtained at 5 μm. Meanwhile the experimental DFG power conversion efficiency was 20.2 μW/W2, with a length-normalized slope efficiency of 15.5 μW/cmW2. The conversion efficiency decreases rapidly from 50 μW/cmW2 at 3.15 μm to 1 μW/cmW2 at 7.92 μm. The wavelength acceptance bandwidth and the angular acceptance bandwidth were measured to be 16.4 cm-1 and 44' for DFG at 5.1 μm, respectively.


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