The laser properties of 1064 nm pulse laser is investigated by optimizing the parameters of resonant cavity, such as mirror curvatures of resonant cavity, the transmission of the output coupler mirror. The results shows that the dynamic state energy and the static state energy increases with the increasing of pumping energy, while the dynamic static ratio decreases with the increasing of pumping energy. Because of the extremely high gain formed at the end-face of the laser with increasing the pump energy, it is easy to generate self-excited oscillation, which leads to the decreasing of the dynamic static ratio. The maximum static state energy with the mirror curvature of 1500 mm is larger than that with the mirror curvature of 1300 mm under the same pump energy. When the curvature of the output coupled mirror is 1500 mm, the dynamic state energy is 88.5 mJ and the dynamic static ratio is 73.0% under the pump energy of 489 mJ with a coupler of 48% transmission. When the transmission of the output coupler mirror increases to 55%, the maximum dynamic state energy is 89.4 mJ and the dynamic static ratio is 73.3% under the pump energy of 523 mJ.
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