A visible /near-IR optical parametric oscillator (OPO) based on type II phase matching in ?-BaB2 O4 (BBO) is described. Pumped at 355 nm, this OPO covers 410 -2500 nm completely with a single set of standard Nd:YAG cavity optics. The output efficiency is >25 %, the linewidth of the OPO is narrower than 1 -2 cm-1 without the use of gratings or etalons, and the signal-beam divergence is <400 ?rad. Three type I BBO doubling crystals are used to extend the tuning range from 208 to 415 nm. Doubling efficiencies as high as 40 % are easily obtained. The reasons for the high doubling and overall system efficiency are discussed.
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Wu et al. (1997) studied this question.
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