An acousto-optic Q-switched 1064 nm quasi-continuous laser with a LD end-pumped Nd: YVO4 crystal is reported. A LBO crystal and a BBO crystal are respectively used in the cavity for intracavity frequency doubling and ext-racavity frequency quadrupling. A 266 nm ultraviolet laser output with a pulse width of 22 ns, a repetition of 20 kHz and an average power of 1. 12 W is obtained. And the optical-optical efficiency is 21. 37%.%报道了LD端面泵浦Nd∶ YVO4晶体、声光调Q 1064 nm准连续紫外激光,采用LBO晶体和BBO晶体分别进行腔内二倍频和腔外四倍频,从而获得266 nm紫外激光输出,脉冲宽度22 ns、重复频率为20 kHz、平均功率1.12W,光-光转换效率(532 ～266 nm)21.37％.
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