Theoretical and experimental research on output characteristics of CrCr⁴⁺:YAG passively Q-switched laser

The output characteristics of Cr4+:YAG passively Q-switched laser was studied theoretically and experimentally. The pulse energy and pulse width for different small signal transmission ratios of Q-switching crystal and different reflection indices of output mirror were simulated. The experimental results show good agreement with the theoretical predictions of energy and pulse width. The results indicate that, with a given laser crystal, the output energy and pulse width are determined by the small signal transmission ratio of the Q-switching crystal and the reflectance ratio of the output coupling mirror. The output energy reduces with the increase of the transmission ratio and there is an optimal reflectance ratio of the output coupling mirror to obtain the maximal output energy. The puls