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Comparative investigation of long-wave infrared generation based on ZnGeP2 and CdSe optical parametric oscillators |
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| Authors: | Yao Bao-Quan Li Gang Zhu Guo-Li Meng Pei-Bei Ju You-Lun and Wang Yue-Zhu |
| Institution: | National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China;National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China;National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China;National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China;National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China;National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China |
| Abstract: | Long-wave infrared (IR) generation based on type-II (o→e+o) phase matching ZnGeP2 (ZGP) and CdSe optical parametric oscillators (OPOs) pumped by a 2.05 μm Tm,Ho:GdVO4 laser is reported. The comparisons of the birefringent walk-off effect and the oscillation threshold between ZGP and CdSe OPOs are performed theoretically and experimentally. For the ZGP OPO, up to 419 mW output at 8.04 μm is obtained at the 8 kHz pump pulse repetition frequency (PRF) with a slope efficiency of 7.6%. This ZGP OPO can be continuously tuned from 7.8 to 8.5 μm. For the CdSe OPO, we demonstrate a 64 mW output at 8.9 μm with a single crystal 28 mm in length. |
| Keywords: | long-wave infrared generation ZGP/CdSe optical parametric oscillator birefringent walk-off effect oscillation threshold |
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