【正文】
cal, the relationship of angle between polarization direction of V3+:YAG and the laser polarization direction, excited state absorption cross section and ground state absorption cross section is investigated. And we designed the Qbox, which can be rotated.(4) The cavity design is optimized by the ABCD transmission matrix of Gaussian beam. The influence between initial transmission of V3+:YAG to the passively Qswiched laser at was investigated with experimental research. The relationship of pulse repetition frequency, pulse width、output power with pump power and initial transmission of V3+:YAG was obtained.(5) For the passive Qswitching operation, the maximum average output power of was achieved