Abstract
Depolarization is one of important factor limits the output extinction ratio of polarization, pulse stability and energy of passively Q-switched Nd:YAG/Cr4+:YAG laser, especially in high pump energy regime. We experimentally investigate the output extinction ratio of polarization, pulse stability and energy with different crystal cuts of Nd:YAG and Cr4+:YAG. We demonstrate that linearly polarized, highly stable passively Q-switched output can be greatly enhanced by adopting [100]-cut Nd:YAG crystal as the gain medium and [110]-cut Cr4+:YAG crystal as the saturable absorber. The output pulse energy is 8.5mJ, repetition frequency is 100Hz, pulse duration is 13ns, extinction ratio of polarization is higher than 800:1 and pulse amplitude instability is 2.8%.
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