## Abstract

By simultaneously using ${\mathrm{V}}^{3+}\text{:}\mathrm{YAG}$ and Co:LMA saturable absorbers in the cavity, a diode-pumped doubly passively Q-switched a-cut $\mathrm{Nd}\text{:}{\mathrm{GdVO}}_{4}$ laser at $1.34\text{}\mathrm{\mu m}$ is demonstrated for the first time. The experimental results show that this doubly passively Q-switched laser can generate a shorter pulse width and a higher peak power compared to the singly passively Q-switched laser only with ${\mathrm{V}}^{3+}\text{:}\mathrm{YAG}$ or Co:LMA saturable absorbers. By considering the thermal lens effect of the laser gain medium, the coupled rate equations for the doubly passively Q-switched laser at $1.34\text{}\mathrm{\mu m}$ under Gaussian approximation are given, and the simulation solutions of the equations are basically identical to the experimental results. The simulation results also show that a doubly passively Q-switched laser can generate a shorter pulse width than a singly passively Q-switched laser even though they have the same initial signal transmissions.

© 2010 Optical Society of America

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