15 February 2018 High efficiency compact mid-IR sources
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We describe mid-IR sources utilizing ZGP and CSP Optical Parametric Oscillators (OPO) directly pumped by high efficiency 1.94 μm Tm:YAP Q-switched lasers. Compact Q-switched Tm:YAP lasers, implemented using Cr:ZnS saturable absorbers, generated 29 kW peak power pulses and an average power of 4W. The OPOs, constructed using the latest generation ZGP and CSP crystals with low 1.94 μm absorption, were operated at near-degeneracy with mid-IR output in the 3.6-4.2 μm range. Various doubly-resonant OPO configurations were evaluated, including single-pass pump pass and double-pass pumping. Maximum mid-IR powers of 2.3 W and 2.5 W and optical conversion efficiencies of 58% and 64% were measured for ZGP and CSP double-pass pump OPOs, respectively.
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Brian Cole, Lew Goldberg, Steve Chinn, Kevin T. Zawilski, Leonard A. Pomeranz, Peter G. Schunemann, John C. McCarthy, F. Kenneth Hopkins, "High efficiency compact mid-IR sources", Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 105110H (15 February 2018); doi: 10.1117/12.2290239; https://doi.org/10.1117/12.2290239


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