Abstract

By delaying the second pass of the pump of a singly resonant optical parametric oscillator, the conversion efficiency can be improved. We show the experimental results of an intracavity-doubled singly resonant parametric oscillator pumped by a Q-switched laser. Using $0.49\mathrm{mJ}$ of pump energy at $532\mathrm{nm}$ from a diode-pumped Nd:YAG laser, $0.085\mathrm{mJ}$ of $488\mathrm{nm}$ was obtained with the optimum delay for the second pass of the pump, giving a conversion efficiency of 17%. The improvement over the case of a single-pass pump was 85%, and the improvement over the double-pass pump with a small delay was 40%.

© 2008 Optical Society of America

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