Abstract
Pumped by a 100 W Q-switched Ho:YAG laser at 2090.7 nm with pulse repetition frequency of 10 kHz, four types of high-power long-wave infrared ZnGeP2 (ZGP) subsequent optical parametric amplifier (OPA) based on optical parametric oscillator (OPO) with different types of phase matching (PM) of ZGP crystals were demonstrated. For the results of 8.2 µm output characteristics at the full incident pump power, Type-II PM ZGP OPO with Type-II PM ZGP OPA had the best M2 of 1.8 and lowest average output power of 9.2 W with the narrowest linewidth of 77 nm, while Type-I PM ZGP OPO with Type-I PM ZGP OPA had the worst M2 of 2.2 and the widest linewidth of 122 nm, and Type-II PM ZGP OPO with Type-I PM ZGP OPA had the highest average output power of 12.6 W, corresponding to overall optical conversion efficiency of 12.6% from Ho to long-wave infrared laser system.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC) (61378029, 51572053 and 61775053), Science Fund for Outstanding Youths of Heilongjiang Province (JQ201310), Fundamental Research funds for the Central Universities (HIT.NSRIF.2014044, and 2015042) and Fundamental Research funds for the Provincial Universities (WL17B14).
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Liu, G., Chen, Y., Yao, B. et al. Study on long-wave infrared ZnGeP2 subsequent optical parametric amplifiers with different types of phase matching of ZnGeP2 crystals. Appl. Phys. B 125, 233 (2019). https://doi.org/10.1007/s00340-019-7347-0
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DOI: https://doi.org/10.1007/s00340-019-7347-0