A 6. 2 W 589 nm yellow laser at a repetition rate of 800 Hz was reported. Double rod and symmetry plane-plane cavity was adopted. The gain medium was Nd: YAG, 11.1 W 1 064 nm and 12. 6 W 1 319 nm was obtained by acousto-optic(AO) Q-switched. The sum-frequency medium was a 4 mm×4 mm×30 mm lithium triborate(LBO) crystal with type I critical phase match. Two beams were combinated with beam splitter and focused into the LBO crystal. A maximum power 6. 2 W of the 589 nm laser was obtained.laser pulse width was 50 ns. The sum-frequency efficiency was 26. 2%. The beam quality factor was 3. 20 and 3. 61 respectively in parallel and perpendicular direction.%报道了一台800 Hz,6.2W外腔和频的589 nm黄光激光器.基频激光器均采用双棒串接平平对称腔,增益介质为Nd:YAG晶体,采用声光调Q方式分别获得11.1W的1 064 nm激光和12.6W的1 319nm激光.和频晶体采用三硼酸锂(LB()),尺寸为4 mm×4 mm×30 mm,采用I类非临界相位匹配.将两束激光通过分光镜合束,聚集后注入LBO晶体,获得589 nm黄光最大输出功率为6.2W,脉宽为50 ns,和频效率26.2％.x方向和y方向的光束质量平方因子分别为3.20和3.61.
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