连续波500W全固态Nd∶YAG激光器研究

Laser-Diode Pumped 500 W Continuous-Wave Nd∶YAG Laser

研制了全国产化全固态半导体激光器(LD)抽运模块,Nd∶YAG激光输出功率达500W。介绍了优化抽运模 块结构参数的程度。从增益分布特性等方面,介绍了研究其输入 输出功率特性的实验装置,随着抽运功率的增加, Nd∶YAG激光输出以斜率效率47%线性增加,最大输出功率达到575W,光 光转换效率达26.1%。采用He Ne 激光探测法实验测量了该抽运模块中的热透镜效应。通过测量热焦距,分析了其热透镜效应:热透镜焦距与抽运 功率成反比,抽运功率很小时,热焦距大,热透镜效应很小,被Nd∶YAG棒的修凹面补偿,所以此时热焦距较大,热 效应不显著。随着抽运功率的增大,热焦距减小,热透镜效应越来越显著。

The output power of homemade all-solid-state laser-diode (LD) pumped Nd:YAG laser above 500 W has been demonstrated in this paper. Experimental setup and the properties of its input-output power were introduced. From the point of gain distribution, the configuration of the LD-pumped laser was optimized. The maximum output power of the Nd:YAG laser was about 575 W. The output power was increased linearly with the pump power at the slope efficiency of 47% above the threshold. The optical-to-optical efficiency of 26.1% was obtained. Through He-Ne laser probe method, the thermal lens effects of the LD-pumped laser were measured. The focal length of thermal lens was measured and compared with the theory. When the pump power was increased, the focal length was decreased, and a kind of means to effectively compensate the thermal lens effects was used in the experiment.