Zhang Bo, Cui Qingfeng, Piao Mingxu, Hu Yang
Appl Opt. 2019 Mar 10;58(8):2058-2067. doi: 10.1364/AO.58.002058.
A mid-wave infrared (MWIR)/long-wave infrared (LWIR) dual-band zoom lens design with multilayer diffractive optical elements (MLDOEs) is presented. The mathematical relationship between the substrate material selection for dual-band MLDOE and polychromatic integral diffraction efficiency (PIDE) is deduced in the oblique incident situation, and further, a method for optimal selection of substrate material is proposed to obtain the high PIDE in an incident angle range. In the optimization process, the optimal substrate material combination is selected based on the proposed method, and the principle of lens material replacement is discussed. After optimization, the 5× hybrid dual-band infrared zoom system is obtained, which consists of seven lenses. The modulation transfer function values in all configurations are larger than 0.5 and 0.3 in MWIR and LWIR, respectively. The distortion values are less than 2% both in MWIR and LWIR for all configurations.
提出了一种采用多层衍射光学元件（MLDOE）的中波红外（MWIR）/长波红外（LWIR）双波段变焦镜头设计。推导了双波段MLDOE在斜入射情况下的基底材料选择与多色积分衍射效率（PIDE）之间的数学关系，并进一步提出了一种在入射角范围内获得高PIDE的基底材料优化选择方法。在优化过程中，基于所提出的方法选择了最佳的基底材料组合，并讨论了透镜材料替换的原则。优化后得到了由七个透镜组成的5倍混合双波段红外变焦系统。在所有配置下，MWIR和LWIR的调制传递函数值分别大于0.5和0.3。在所有配置下，MWIR和LWIR的畸变值均小于2%。
