## Abstract

By using $\mathrm{Rb}\mathrm{Ti}\mathrm{O}\mathrm{P}{\mathrm{O}}_{4}$ (RTP) crystals as an electro-optic (EO) modulator and ${\mathrm{Cr}}^{4+}:\mathrm{YAG}$ saturable absorber as a passive *Q* switch, a high repetition rate doubly *Q*-switched intracavity optical parametric oscillator (IOPO) is realized. In comparison to an EO Q-switched IOPO, the lower threshold energy, the higher output energy, the narrower pulse width, and the higher conversion efficiency from the doubly *Q*-switched IOPO can be obtained. By considering the gradual loss from the delayed switched time of the EO switch, the coupled rate equations of doubly *Q*-switched IOPO under the assumption of the uniform distributions of the intracavity photon densities are given, and the numerical solution of the equations fits the experimental data well.

© 2007 Optical Society of America

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