热效应对激光器光束质量的自适应调整技术  

Adaptive Adjusting Technique of Thermal Effect to Laser Beam Quality

作　　者：屈鹏飞[1] 王石语[1] 过振[1] 蔡德芳[1] 李兵斌[1] 

机构地区：[1]西安电子科技大学物理与光电工程学院,陕西西安710071

出　　处：《光学学报》2017年第5期148-155,共8页Acta Optica Sinica

基　　金：国家预研究基金(9140A020105)

摘　　要：在固体激光器中,热效应会同时影响抽运光和振荡光的空间分布。研究表明,对于端面抽运固体激光器而言,通常存在一个特定的抽运功率区间,使抽运光与基模振荡光在热效应的作用下,在增益介质内部高度重合,激光器的抽运光效率和光束质量得到大幅度提升。利用这一特点,设计了一种激光器,在抽运功率为105~115 W时,实现了抽运光与基模振荡光空间分布的高度重合,激光器光束质量因子小于2.3。在此区间外,激光器光束质量因子迅速增加到3以上。提出了一种计算上述抽运功率区间的优化算法,在端面抽运固体激光器中,可以快速寻找到理想的抽运功率区间,并与上述实验进行对比,结果表明使用该方法寻找到的抽运功率区间与实验所得到的区间高度吻合,相对误差低于5%,可靠性高。Spatial distributions of pump beam and oscillating beam will be affected by thermal effect in solid state laser. The research shows that a specific pump power region is existed in end-pumped solid state laser. In this interval, pump beam and fundamental mode oscillating beam achieve large overlap in the gain medium under thermal effect, which results in higher efficiency of pump source and better beam quality of laser. Based on the characteristic, a laser is designed. Spatial distributions between pump beam and fundamental mode oscillating beam of the laser can achieve large overlap, and the beam quality factor is lower than 2.3 with pumping power ranging from 105 W to 115 W. Out of this range, the beam quality rapidly increases to more than 3. A new optimization algorithm is proposed to calculate the pump power region, which can find ideal pump power region rapidly in end-pumped solid state laser. Compared with the experiment, the pump power region of the proposed method achieves a higher level of compliance with experimental region, and the relative error is less than 5 % with high reliability.

关 键 词：激光器 固体激光器 热透镜 空间分布 光束质量 

分 类 号：TN248.1[电子电信—物理电子学]