Piao Mingxu, Cui Qingfeng, Zhang Bo, Zhao Chunzhu
Appl Opt. 2018 Oct 20;57(30):8861-8869. doi: 10.1364/AO.57.008861.
A method for the optimal design of multilayer diffractive optical elements (MLDOEs) with consideration of ambient temperature is presented to improve the image quality over the entire temperature range. The relationship between diffraction efficiency and temperature is analyzed, and an optimization process of surface relief height for the MLDOEs is given. A practical 3-5 μm athermal hybrid optical system with a double-layer diffractive optical element is designed in the temperature range from -20°C to 60°C, and the image quality of two hybrid optical systems with optimized MLDOE and original MLDOE is compared. The result shows that the comprehensive modulation transfer function is obviously improved in the whole working temperature range. This method can be used during the passive athermalization hybrid optical system design with MLDOEs.
提出了一种考虑环境温度的多层衍射光学元件（MLDOEs）优化设计方法，以在整个温度范围内提高图像质量。分析了衍射效率与温度之间的关系，并给出了MLDOEs表面浮雕高度的优化过程。设计了一个实用的3-5μm无热混合光学系统，该系统具有双层衍射光学元件，工作温度范围为-20°C至60°C，并比较了具有优化MLDOE和原始MLDOE的两种混合光学系统的图像质量。结果表明，在整个工作温度范围内，综合调制传递函数有明显提高。该方法可用于基于MLDOEs的被动无热混合光学系统设计。
