Abstract
We report a high-repetition-rate (1–10-kHz) optical parametric oscillator (OPO) based on noncritically phase-matched (ZGP). The pump source was an OPO based on periodically pole lithium niobate that was pumped in turn by a -switched diode-pumped Nd:YAG laser. The ZGP OPO yielded continuously tunable output from 3.7 to by tuning of the pump wavelength from 2.3 to . At the optimal pump focusing, the minimum ZGP OPO threshold achieved was , which is to our knowledge the lowest ever reported for a singly resonant OPO. The output energy in the range was , and the quantum efficiency of converting radiation to the mid IR exceeded 10%.
© 2003 Optical Society of America
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