Gan Zi-Hao, Peng Xiao-Qiang, Chen Shan-Yong, Guan Chao-Liang, Hu Hao, Li Xin-Lei, Dai Zuo-Cai
Appl Opt. 2018 Dec 1;57(34):9913-9921. doi: 10.1364/AO.57.009913.
A computer-generated hologram (CGH) is the core component for an aspheric surface test. According to fabrication demands, it is necessary to convert the designed CGH phase compensation function into the processed pattern, that is, the fringe discretization process. In this paper, we propose a new discretization method for a CGH in a test of the freeform surface, and realized the encoding of processed fringes by MATLAB software. Furthermore, we designed the experiment to verify the accuracy of the new discretization method and compared the calculation efficiency between the new algorithm and the reported algorithm. Finally, based on the testing requirement of a freeform mirror in a camera optical system, we completed the design, encoding, and fabrication of the CGH sample, and analyzed the influence of various errors on wavefront accuracy of the CGH.
计算机生成全息图（CGH）是用于非球面表面测试的核心部件。根据制作要求，有必要将设计好的CGH相位补偿函数转换为处理后的图案，即条纹离散化过程。在本文中，我们提出了一种用于自由曲面测试中CGH的新离散化方法，并通过MATLAB软件实现了处理后条纹的编码。此外，我们设计了实验来验证新离散化方法的准确性，并比较了新算法与已报道算法之间的计算效率。最后，基于相机光学系统中自由曲面镜的测试要求，我们完成了CGH样品的设计、编码和制作，并分析了各种误差对CGH波前精度的影响。
