## Abstract

Using an acousto-optic modulator (AOM) and ${\mathrm{Cr}}^{4+}\text{:}\mathrm{YAG}$ as the dual-loss modulation, an intracavity ${\mathrm{KTiOPO}}_{4}$ optical parametric oscillator (OPO) pumped by a simultaneously $Q$-switched and mode-locked (QML) ${\mathrm{YVO}}_{4}/\mathrm{Nd}\text{:}{\mathrm{YVO}}_{4}$ laser was realized. The shortest mode-locking pulse duration of the signal wave at 1573 nm was directly measured as 450 ps at an AOM frequency of 2 kHz and a diode pump power of 10.5 W, corresponding to a peak power of 35.5 kW. The temperature tuning of the output signal wavelength was realized in the range from 1571.99 to 1572.61 nm with a blueshift ratio of $0.027\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{nm}/\mathrm{\xb0C}$. A set of coupled rate equations for the dual-loss-modulated QML laser pumping intracavity OPO was built for the first time to our knowledge. The numerical solutions were fitted with the experimental results.

© 2015 Optical Society of America

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