Hu Yang, Cui Qingfeng, Sun Lin, Zhang Bo
Appl Opt. 2020 Feb 1;59(4):1212-1216. doi: 10.1364/AO.381214.
Because of material limitations, achieving an athermal design for dual-waveband infrared systems is difficult. This study integrates single-layer diffractive elements to reduce the volume and weight of such a design and introduces optical-digital joint methods to eliminate the impact of low diffraction efficiency. To achieve athermalization, temperature polychromatic integral diffraction efficiency and temperature integral wavelength weight are incorporated in the point spread function (PSF) model. Influence of low diffraction efficiency is eliminated via subsequent algorithm processing. Accordingly, athermal design and processing of a cooled dual-waveband infrared system is achieved and verified via experimental results.
由于材料限制，实现双波段红外系统的无热设计具有挑战性。本研究集成了单层衍射元件以减小此类设计的体积和重量，并引入了光学-数字联合方法来消除低衍射效率的影响。为了实现无热化，将温度多色积分衍射效率和温度积分波长权重纳入点扩散函数（PSF）模型。通过后续算法处理消除低衍射效率的影响。据此，实现了冷却双波段红外系统的无热设计与处理，并通过实验结果进行了验证。
