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A mW-class continuous-wave single-frequency tunable mid-infrared beam was produced at 4 μm via difference frequency generation (DFG) of two near-infrared beams at about 850 nm and 1056 nm. The pump and the signal beams of 1Wand 5.5 W, respectively, are incident onto a MgO-doped periodically-poled congruent lithium-niobate crystal (MgO-doped PPCLN) for the DFG process. This system produces an idler...
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