Abstract
Using 100 psec Nd:YAG pump pulses, we synchronously pump an optical parametric oscillator with intracavity difference-frequency mixing (DFM) between the signal and idler. The cavity is singly resonant at the sig-na1 frequency. The signal, idler and difference wavelengths are near 1.5, 3.5 and 2.8 µm, respectively. Periodically poled lithium niobate is used for both interactions. Results show an 80% enhancement in the idler power conversion efficiency and an idler photon-conversion efficiency of 110% when the DFM interaction is phasematched. Back conversion of the pump is suppressed when the DFM interaction is phasematched, and pump depletion increases from 65% to 79% at full pump power.
© 1998 Optical Society of America
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