连续Nd:YAG激光器腔长与扩束系统对输出功率的影响  

Influence of Cavity Length and Beam Expander of CW Nd:YAG Solid-state Laser on Laser Output Power

作　　者：罗梦珠[1,2] 王文先[1,2] 崔泽琴[1,2] 许并社[1,2] 

机构地区：[1]材料界面科学与工程省部共建教育部重点实验室,山西太原030024 [2]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《太原理工大学学报》2009年第3期287-290,共4页Journal of Taiyuan University of Technology

基　　金：山西省自然科学基金资助项目(2008011044)

摘　　要：为了提高激光器输出功率,优化激光器结构尺寸和扩束系统是提高固体Nd:YAG激光器输出功率的两个重要因素。通过选择和优化激光器腔长与反射输出镜透过率的不同组合,实验测试表明,激光器腔长与输出镜透过率的最佳组合参数为L1=L2=140 mm,T=40%,激光器的斜率效率为4.5%.设计了凹凸透镜组合和扩束比为3倍的扩束系统。通过分析热传导在扩束系统中的作用过程,计算出扩束比与连续Nd:YAG激光器功率数学关系和扩束系统镜片的传热系数。使激光器最大输出功率比设计理论值增加25W左右。In order to improve laser output power of CW Nd：YAG laser, optimized structure size and beam expander are two important factors. By selecting and optimizing different combina- tions of laser cavity length and reflective output mirror transmittance, the experimental results show that the best combination of parameters of laser cavity length and reflective output mirror transmittance are as follows： L1 =L2 = 140 mm, T= 40%, the laser slope efficiency is 4.5%. A beam expander is designed with expander ratio of 3. By analyzing the action process of heat exchange in beam expander, the mathematical relationship between beam expander ratio and CW Nd：YAG laser output power and the thermal conductivity of lenses of beam expander are calculated. As a result, the maximum laser output power is increased by around 25W with respect to the theoretical design value.

关 键 词：激光器功率 透过率 腔长 扩束系统 

分 类 号：TH744[机械工程—光学工程]