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在所有激光二极管(LD)侧面抽运的固体激光器的输出功率曲线中都存在一个平缓区域。通过对径向和切向热透镜焦距的理论计算,发现平缓区域出现在径向稳区边缘,在平缓区之后输出功率将继续升高,并在切向稳区边缘达到最大值,此时M2理论值最小。得出平缓区是由径向、切向稳区的共同作用导致的,并且在切向稳区边缘可以实现高亮度激光器的结论。基于以上理论分析,设计了一个具有简单平-平腔结构、LD侧面抽运的Nd∶YAG高亮度激光器。实验中采用短腔型,并使其工作在稳功率点,当腔长为200 mm,入射的抽运光功率为220 W时,获得了输出功率为50 W,M2理论值为2的高亮度1064 nm连续激光输出。
There is a flat area in the output power curve of the solid-state laser pumped on all laser diode (LD) sides. By calculating the focal length of the radial and tangential thermal lens, it is found that the flat area appears at the edge of the radial steady zone, and the output power will continue to increase after the flat zone and reaches the maximum at the edge of the tangential steady zone. At this moment, M2 The theoretical minimum. It is concluded that the flat zone is caused by the combination of radial and tangential steady zones, and the conclusion of high brightness laser can be realized at the edge of tangential zone. Based on the above theoretical analysis, a Nd: YAG high brightness laser with a simple flat-cavity structure and LD side pumping is designed. In the experiment, the short cavity type is adopted and its working is at steady power point. When the cavity length is 200 mm and the incident pump power is 220 W, the output power is 50 W and the theoretical value of M2 is 2 1064 nm continuous laser output.