Efficient cw violet-light generation in a ring cavity with a periodically poled KTP |
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| Authors: | Fu-Yuan Wang Bao-Sen Shi Qun-Feng Chen Chang Zhai Guang-Can Guo |
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| Affiliation: | 1. Lightwave Communications Research Group, Department of Electrical and Computer Engineering, School of Engineering, Democritus University of Thrace, 12 Vas. Sofias Str., GR 67 100, Xanthi, Greece;2. Department of Aircraft Technology, Technological Educational Institute of Chalkis, Chalkis, Greece;1. Department of Physics, Nanjing Normal University, Nanjing 210023, China;2. Hezhou University, Hezhou 542899, China;1. Department of Nuclear Engineering, Faculty of Advance Sciences and Technologies, University of Isfahan, Isfahan 81746-73441, Iran;2. Crystal Growth Laboratory, Metallurgy Group, Material Research School, NSTRI, Tehran 14395-836, Iran;3. Solid State Lasers Department, Laser and Optics Research School, Tehran, 11365-8486, Iran;4. Department of Physics, Faculty of Science, University of Isfahan, Isfahan 81746-73441, Iran;5. Department of Physics, Faculty of Science, University Putra Malaysia UPM, Serdang, 43400 Selangor, Malaysia |
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| Abstract: | In this work, we experimentally demonstrate an efficient cw second harmonic generation (SHG) at 780 nm wavelength with a first-order type-I phase matching periodically poled KTP (PPKTP) crystal in a ring cavity, the wavelength corresponds to the D2 line of Rb atom transition. The fundamental laser used is a grating-stabilized external cavity diode laser and its frequency is precisely locked to Rb atom transition frequency using the saturated absorption technique. About maximal 6.9 mW UV radiation of 390 nm with a net conversion of 9.5% at an input mode-matched power of 73 mW is generated with one crystal, and about maximal 8.8 mW with the net conversion of 12% is obtained with another crystal; the powers in stable operation are about 1.7 mW and 3.4 mW, respectively. This is, to our best knowledge, the first SHG experiment at 780 nm wavelength with the PPKTP in a ring cavity. |
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