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고광훈,김용희,김민호,박현민,조재완,이림,임권,차용호,김택수,정도영,K-H. Ko 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.12
A mW-class continuous-wave single-frequency tunable mid-infrared beam was produced at 4 μmvia difference frequency generation (DFG) of two near-infrared beams at about 850 nm and 1056nm. The pump and the signal beams of 1Wand 5.5 W, respectively, are incident onto a MgO-dopedperiodically-poled congruent lithium-niobate crystal (MgO-doped PPCLN) for the DFG process. This system produces an idler beam with powers of approximately 0.95 mW at 4.47 μm and 1.9mW at 4.0 μm. We investigate the mid-infrared beam characteristics, such as the power, beamquality, tuning range and so on.