通过对自然双折射晶体Nd∶YVO4偏振特性的研究，采用带有楔角的Nd∶YVO4晶体进行电光调Q，腔内可以不加入偏振片，这种设计有简化腔内元件、缩短腔长和降低损耗的优点，可得到更高的功率和更窄的激光脉冲宽度。实验使用尺寸3 mm×3 mm×5 mm，10°楔角的Nd∶YVO4晶体，用La3Ga5SiO14晶体作为退压式调Q元件，在1 kHz重复频率下，获得平均输出功率2.2 W，脉冲宽度6.3 ns，光光转换效率39.2%，峰值功率超过300 kW的激光输出。

A design to realize electro-optic Q-switch in Nd∶YVO4 laser without polarizer is presented, in which a Nd∶YVO4 crystal with a wedge angle is used by analyzing the polarization of natural birefringent crystal. This design has the advantages of simplifying cavity components, shortening cavity length, and reducing cavity loss, and can obtain higher power and narrower pulse width. Voltage-decreased Q-switching is realized by using a La3Ga5SiO14 crystal and a Nd∶YVO4 crystal with the size of 3 mm×3 mm×5 mm, 10° wedge angle. 2.2 W average power, 6.3 ns pulse width, optical-to-optical efficiency of 39.2%, and more than 300 kW peak power are obtained when the repetition rate is 1 kHz.