中国激光, 2011, 38 (4): 0403003, 网络出版: 2011-03-24
新型高功率激光加工用激光光束展宽方法的探索性研究
An Exploratory Investigation of Wide-Band Beam Shaping for High Power Laser Processing
激光技术 光束展宽 新型扇形类抛物面聚焦镜 光线追迹 聚焦特性 laser technique beam expansion novel fan-shaped quasi-parabolic mirror ray tracing focusing characteristics
摘要
探索性地提出了一种基于新型扇形类抛物面聚焦镜的高功率激光加工用激光光束的展宽方法，并对该方法的实现原理和光路设计进行了研究与相关实验验证。根据几何光学原理，采用光线追迹的方法，对实际激光光束经新型光束展宽系统变换后的聚焦特性进行了分析。理论结果表明，通过光束展宽系统变换后，能够将原始圆形激光束连续扫描展宽为光强分布均匀的大尺寸（20~500 mm）弧形条状聚焦光斑。利用横流CO2激光器，对该光束展宽系统的实际光学变换特性进行了初步实验研究，实验结果与理论结果相符合。
Abstract
A novel high-power wide-band laser beam shaping method using a fan-shaped quasi-parabolic mirror is exploringly proposed. The design principle and preliminary experimental results of the wide-band beam shaping system based on a fan-shaped quasi-parabolic mirror are presented. According to the geometrical optics, the focusing characteristics of a real beam passing through the beam wide-band shaping system are investigated by ray tracing. It is demonstrated that, after transformed by the wide-band beam shaping system, the original high-power circular laser beam can be shaped into an arc-shaped scanning strip of uniform intensity distribution and large size (20~500 mm). By using a transverse flow CO2 laser, the optical transformation characteristics of the actual wide-band beam shaping system are invested. The experimental and theoretical results are in good agreement.
罗曦, 陈培锋, 王英, 梁乔春, 杜建伟. 新型高功率激光加工用激光光束展宽方法的探索性研究[J]. 中国激光, 2011, 38(4): 0403003. Luo Xi, Chen Peifeng, Wang Ying, Liang Qiaochun, Du Jianwei. An Exploratory Investigation of Wide-Band Beam Shaping for High Power Laser Processing[J]. Chinese Journal of Lasers, 2011, 38(4): 0403003.
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