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Development of an efficient coherent optical source at 6.04 μm
Affiliation:1. Department of Physics and Meteorology, IIT Kharagpur – 721 302, India;2. Department of Electrical Engineering, IIT Kharagpur – 721 302, India;3. Laser and Plasma Technology Division, BARC, Mumbai – 400 085, India;1. Department of Electrical & Electronics Engineering, CMR Institute of Technology, Bengaluru, Karnataka 560037, India;2. Department of Electrical Engineering, National Institute of Technology, Agartala, Tripura 799046, India;1. Department of Nuclear Engineering and Management, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8654, Japan;2. Collaborative Laboratories for Advanced Decommissioning Sciences (CLADS), Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan;3. Nuclear Professional School, University of Tokyo, 2-22 Shirane, Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1188, Japan;1. State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 10084, PR China;2. High-Tech Institute, Qing Zhou, Shan Dong 262500, PR China;3. Xi''an High-Tech Institute, Xi׳an 710025, PR China
Abstract:Efficiency as high as 26% is obtained for generation of mid-infrared radiation at 6.04 μm by frequency doubling of ammonia laser emission at 12.08 μm in a 15 mm long type-I cut AgGaSe2 crystal. The NH3 laser used for this work is optically pumped by a commercial TEA CO2 laser operating on 9.22 μm and produces pulsed output of ∼210 mJ with a duration of ∼200 ns at 12.08 μm. The generated radiation at 6.04 μm is separated out from the residual radiation at 12.08 μm by exploiting the principle of polarization dependent diffraction of reflection grating.
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