mW-class continuous-wave mid-infrared generation in the 4-μm region by using difference frequency generation with a MgO-doped PPCLN crystal

• Published in: Journal of the Korean Physical Society Vol. 65; no. 12; pp. 2033 - 2039
• Main Authors: Ko, Kwang-Hoon, Kim, Yonghee, Kim, Min-Ho, Park, Hyunmin, Cho, Jai Wan, Lee, Lim, Lim, Gwon, Cha, Yong-Ho, Kim, Taek-Soo, Jeong, Do-Young, Ko, K-H.
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.12.2014; 한국물리학회
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학; Difference frequency generation; MgO-doped periodically-poled congruent lithium niobate; PPCLN; mid-infrared
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.65.2033

A mW-class continuous-wave single-frequency tunable mid-infrared beam was produced at 4 μ m 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 beam with powers of approximately 0.95 mW at 4.47 μ m and 1.9 mW at 4.0 μ m. We investigate the mid-infrared beam characteristics, such as the power, beam quality, tuning range and so on.