Abstract

By simultaneously using V3+:YAG and Co:LMA saturable absorbers in the cavity, a diode-pumped doubly passively Q-switched a-cut Nd:GdVO4 laser at 1.34μm 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 V3+: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 1.34μm 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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