Piao Mingxu, Cui Qingfeng, Zhao Chunzhu, Zhang Bo, Mao Shan, Zhao Yuanming, Zhao Lidong
Appl Opt. 2017 Apr 1;56(10):2826-2833. doi: 10.1364/AO.56.002826.
We present a substrate material selection method for multilayer diffractive optical elements (MLDOEs) to obtain high polychromatic integral diffraction efficiency (PIDE) in a wide environmental temperature range. The extended expressions of the surface relief heights for the MLDOEs are deduced with consideration of the influence of the environmental temperature. The PIDE difference Δη¯(λ) and PIDE change factor F are introduced to select a reasonable substrate material combination. A smaller value of Δη¯(λ) or F indicates a smaller decrease of the PIDE in a wide temperature range, and the corresponding substrate material combination is better. According to the deduced relation, double-layer and three-layer DOEs with different combinations are discussed. The results show that IRG26 and zinc sulfide is the best substrate material combination in the infrared waveband for double-layer DOEs, and polycarbonate is more reasonable than polymethyl methacrylate as the middle filling optical material for three-layer DOEs when the two substrate materials are the same.
我们提出了一种用于多层衍射光学元件（MLDOE）的衬底材料选择方法，以在较宽的环境温度范围内获得高的多色积分衍射效率（PIDE）。考虑到环境温度的影响，推导了MLDOE表面起伏高度的扩展表达式。引入PIDE差值 Δη¯(λ) 和PIDE变化因子F来选择合理的衬底材料组合。 Δη¯(λ) 或F的值越小，表明在宽温度范围内PIDE的下降越小，相应的衬底材料组合越好。根据推导的关系，讨论了不同组合的双层和三层DOE。结果表明，对于双层DOE，IRG26和硫化锌是红外波段最佳的衬底材料组合；当两种衬底材料相同时，聚碳酸酯作为三层DOE的中间填充光学材料比聚甲基丙烯酸甲酯更合理。
