Abstract
By using RbTiOPO4 (RTP) crystals as an electro-optic (EO) modulator and Cr4+: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.
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