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We have studied doubly resonant parametric oscillation in the regime of maximum conversion efficiency. A monolithic MgO:LiNbO3 resonator with a threshold of 28 mW, pumped by a frequency-doubled Nd:YAG laser, was employed. With an active frequency-stabilization scheme, single-mode operation without mode hops at 105 mW combined signal and idler output power was achieved at a pump power four times above threshold, with a conversion efficiency of 81%. Excellent agreement between theory and experiment was found for the dependence of efficiency and depletion on pump power. The efficiency and the nearly complete pump depletion of 94% were limited only by imperfect mode matching of the pump wave and by the small cavity losses.
© 1995 Optical Society of America
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