Zhang Bo, Piao Mingxu, Cui Qingfeng
Opt Express. 2019 Oct 28;27(22):32337-32348. doi: 10.1364/OE.27.032337.
This paper proposes an achromatic annular folded lens (AFL) with a reflective-diffractive optical element (RDOE). We derive novel mathematical models of the diffraction efficiency and polychromatic integral diffraction efficiency (PIDE) of the RDOE and an expression for its microstructure height. An AFL with an RDOE made of an optical plastic substrate material is designed in the visible waveband. To minimize the influence of incident angle on the diffraction efficiency and PIDE, the microstructure height is optimized. The design results indicate that the lateral color of the AFL is corrected, the modulation transfer function considering the diffraction efficiency is larger than 0.25 at 111 cycles/mm for all field of views. The hybrid AFL outperforms the conventional refractive imaging system in terms of the system size, volume, and image quality under the same specifications. It can be used in new-generation miniaturized imaging systems.
本文提出了一种带有反射衍射光学元件（RDOE）的消色差环形折叠透镜（AFL）。我们推导了RDOE的衍射效率和多色积分衍射效率（PIDE）的新型数学模型及其微结构高度的表达式。设计了一种在可见光波段由光学塑料基底材料制成的带有RDOE的AFL。为了最小化入射角对衍射效率和PIDE的影响，对微结构高度进行了优化。设计结果表明，AFL的横向色差得到了校正，在所有视场下，考虑衍射效率的调制传递函数在111线对/毫米处大于0.25。在相同规格下，混合AFL在系统尺寸、体积和图像质量方面优于传统折射成像系统。它可用于新一代小型化成像系统。
