A new optical parametric oscillator based on the pumping of noncritically phase-matched lithium triborate at 266 nm is reported. Tunable in the UV near 314 nm and in the IR near 1.74 μm, pump pulse energies of 0.5 mJ (~10-ns pulses at 266 nm) are sufficient to reach oscillation threshold, and pump depletions of ~25% at 3–4 times threshold are obtained.
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Tang et al. (1992) studied this question.