Simulation of relief-type diffractive lenses in ZEMAX using parametric modelling and scalar diffraction

Nemes-Czopf Anna; Bercsenyi Daniel; Erdei Gabor

摘要

For the simulation of relief-type diffractive surfaces, efficient method has been developed and described. Based on zone decomposition, our approach maps the transmitted wavefront by ray tracing, while point spread function/modulation transfer function (PSF/MTF) plots are calculated by scalar diffraction, taking light diffracted into multiple orders into account inherently. Using a parametric user-defined surface, our solution makes the analysis and optimization of diffractive lenses possible directly inside optical design software. Implementation was carried out in ZEMAX in the form of a swift Windows Dynamic Link Library extension using an approximative, non-iterative algorithm. The average computation time increments relative to standard built-in surfaces are 38% and 21% for PSF and MTF calculations, respectively. Application of our method is illustrated by the analysis of diffractive intraocular lenses. For validation, numerical results were compared with analytical formulae and industry-standard measurements. The ray-tracing error caused by our approximation proved to be less than 7. 10(-6) wavelength, and the difference from the theoretical MTF calculations is 1%-2%. The RMS difference of the simulated-measured through-focus MTF values at 50 lp/mm is 0.031, equaling 2cr measuring accuracy. (C) 2019 Optical Society of America

机译：为了模拟释放型衍射表面，已经开发和描述了有效的方法。基于区域分解，我们的方法通过光线跟踪映射传输的波前，而点扩展功能/调制传递函数（PSF / MTF）图通过标量衍射计算，以固有地考虑到多个订单中的光衍射到多个订单中。使用参数化用户定义的表面，我们的解决方案可以直接在光学设计软件内部进行分析和优化衍射镜头。使用近似非迭代算法，以SWIFT Windows动态链接库扩展的形式在ZEMAX中执行实现。对于PSF和MTF计算，平均计算时间增量是相对于标准内置表面的38％和21％。通过对衍射眼透镜的分析来说明我们的方法的应用。为了验证，将数值结果与分析公式和行业标准测量进行比较。由我们的近似引起的光线跟踪误差被证明是小于7. 10（-6）波长，并且与理论MTF计算的差异为1％-2％。在50Lp / mm处的模拟测量的通过聚焦MTF值的RMS差为0.031，等于2CR测量精度。（c）2019年光学学会

Simulation of relief-type diffractive lenses in ZEMAX using parametric modelling and scalar diffraction

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