Abstract
A line tunable singly resonant noncritically phase matched narrow band width ZnGeP2 (ZGP) optical parametric oscillator pumped by the output idler radiation from a KTA OPO based on a 20mm long KTA crystal pumped from a Q-switched Gaussian shaped Nd:YAG laser beam with a grating having grooves density 85lines/mm has been demonstrated in the spectral ranges of 3–7μm. The measured threshold of oscillation energy was 10μJ. The conversion efficiency was 20.5% and slope efficiency of the ZGP OPO was 20% using a 23mm long ZGP crystal at 26mm cavity length. Line width of the generated infrared radiation from ZGP OPO was 37–60nm.
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