Spatial laser beam shaping using aspheric Galilean beam expansion system
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摘要: 为实现高功率TEA CO2激光束空间整形,需要设计一套非球面伽利略型整形扩束系统,将束腰8mm的基模高斯光束整形扩束到直径25mm.根据基于几何光学原理导出的系统理论模型,采用龙贝格数值积分算法得到40组描述非球面的数据,非线性最小二乘法拟合数据,获得两个非球面矢高解析式.为验证所设计镜头的光束空间整形效果,用光学软件ZEMAX对束腰8mm的基模高斯光束进行了整形仿真,光线光路追迹结果与理论设计吻合.仿真整形结果表明,可以获得直径25mm的平顶光束,出射波面面形峰谷值误差25个波长,输出基本为平行光.这为进一步工程应用作了必要准备.Abstract: It's desirable to design a set of aspheric Galilean laser beam expansion system which can reshape high power TEA CO2 laser beam with waist of 8mm to a diameter of 25mm.Based on the mathematical model and the Romberg numerical integrating algorithm,an array with 40 sets of data was obtained to describe the aspheric surfaces.By fitting the data with the method of the nonlinear least square,the sag's analytical equations of aspheric surfaces were obtained.Using the optical design software package,ZEMAX,the Gaussian beam with beam waist 8mm was emulated passing through the designed beam reshaping system.The results show that the designed system can reshape the entrance Gaussian beam,the peak-valley wavefront error of the flat-top output with a diameter of 25mm is about 25 waves,which proves it being collimated.It makes necessary preparation for further applications.
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Keywords:
- laser technique /
- beam reshaping /
- geometric optics /
- flat-top beam
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