中文摘要：

为了提高激光光束的应用水平,需要将高斯光束整形为平顶光束。分析了非球面高斯光束均束器的基本原理和设计理论,选用超高斯光束函数作为平顶光束的数学-物理模型,建立了入射高斯光束与出射平顶光束之间的映射关系式,给出了高阶非球面的面型参数,利用光学设计软件ZEMAX设计了高斯光束均束器光学系统。系统入射光束直径为2mm,出射光束直径为4mm,激光波长为1064nm。分析了能量转换效率,根据Bessel公式定义了平顶光束的平顶度。设计结果实现了激光束的2倍准直扩束、95.98%的能量转换效率和96.6%的平顶度。

英文摘要：

In order to improve the application level of laser technology, it is necessary to convert a Gaussian beam to a flattop beam. The basic principles and design theory of aspheric Gaussian beam homogenizer was analyzed, and the function of super Gaussian beam was chosen as the mathematical and physical model of flattop beam. The mapping formula of the incident Gaussian beam and the output flattop beam w established. Then, the surface coefficient of high order even aspheric was given. Moreover, the optical system of Ganssian beam homogenizer was designed with optical design sot~ceare ZEMAX. The incident beam diameter was 2 mm, the output beam diameter was 4 mm and the wavelength of the laser was 1 064 nm. The energy conversion efficiency was analyzed, and the flattened degree of flattop beam was defined according to the Bessel formula. The design results show that the multiplying power of collimated laser beam expander is 2, the energy conversion efficiency is 95.98% and the flattened degree is 96.6%.