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通过优化平-凹-平三镜折叠腔结构设计,利用大功率半导体激光器侧面抽运、Ⅱ类相位匹配KTP晶体腔内倍频,获得高效高功率连续绿色激光输出.当抽运电流约为36 A时,得到最高36.6 W的连续绿光激光输出,对应的光—光转换效率为8.71%.在输出功率33 W时测量激光功率稳定性,其功率不稳定度为0.27%.用刀口法测量了激光器高输出功率时的光束质量,光束质量因子小于8.对高功率抽运情况下三镜折叠腔的像散补偿、失调灵敏度和基模在腔内分布情况做了数值模拟.
By optimizing the structure of the flat-concave-flat three-mirror folding cavity, high-power and high-power continuous green laser output is achieved by side-pumped with high power semiconductor laser and phase-locked with phase-matched KTP crystal in phase Ⅱ type. When the pumping current is about 36 A, a continuous green laser output of up to 36.6 W was obtained, corresponding to a light-to-light conversion efficiency of 8.71%, laser power stability was measured at an output power of 33 W, and its power instability was 0.27% When the laser output power is high, the beam quality and the beam quality factor are less than 8. The astigmatism compensation, offset sensitivity and fundamental mode distribution in the cavity of three mirrors with high power pumping are numerically simulated.