基于ZEMAX用户自定义操作数的波前编码成像系统优化设计

Optimization of wavefront coding imaging systems based on ZEMAX user defined operands

针对目前波前编码成像系统中相位板的设计工作量大且未能考虑除相位板外其它光学元件像差的问题,提出了两种基于常用光学设计软件ZEMAX的优化设计方法:使用ZPL宏指令编写用户自定义操作数,优化点扩散函数的能量集中度和一致性,实现了旋转对称型相位板的设计,以斯托列尔比不小于0.8为衡量标准,设计结果使景深扩展到传统光学系统的5.5倍;使用在外部定义和编译的C程序编写用户自定义操作数,优化调制传递函数的离焦不变性,实现了奇对称型相位板的设计;以MTF离焦不变性为衡量标准,设计结果使景深扩展到传统光学系统的12.5倍,而同等条件下的三次方相位板只能使景深扩展到传统光学系统的10.1倍。得到的实验结果说明本文所述设计方法是方便而有效的。

As the design of phase mask in wavefront coding imaging systems is complex and the aberration of original optics cannot be taken into consideration, two new design methods are proposed based on the popular optical software ZEMAX. By using ZPL macros, the user defined operands are written to optimize the energy concentration and consistency of the point spread function, and the depth of focus of the optimized rotationally symmetric phase mask is 5.5 times as large as that of traditional imaging systems at the criterion of Strehl ratio larger than 0.8. By using an externally defined and compiled C program, the user defined operands are written to optimize the defocus invariance of modulation transfer function, and the depth of focus of the optimized odd symmetric phase mask is 12.5 times as large as that of traditional imaging systems. However,the depth of focus of the cubic phase mask isonly 10.1 times as large as that of traditional one in the same condition. These results show that the design methods proposed are practical and effective.