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 |
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| Affiliation: | National Key Laboratory of Tunable Laser Technology,Harbin Institute of Technology,Harbin 150001,China |
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| Abstract: | Long-wave infrared(IR) generation based on type-II(o→e+o) phase matching ZnGeP 2(ZGP) and CdSe optical parametric oscillators(OPOs) pumped by a 2.05 μm Tm,Ho:GdVO 4 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. |
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| Keywords: | long-wave infrared generation ZGP/CdSe optical parametric oscillator birefringent walk-off effect oscillation threshold |
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