Abstract
Efficiencies of 36% have been observed for the conversion of pumping power to optical parametric oscillator (OPO) output power by pumping with the second harmonic of a pulsed single-mode laser. Previous reports which all used multimode pumps gave a maximum efficiency of about 1%. Unlike oscillators with multimode pumps, field amplitudes were observed to approach steady-state values and the OPO functioned as a power limiter for transmitted pump light. Good agreement has been found between theoretical and experimental conversion efficiencies.

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