MWIR refractive /diffractive hybrid athermal optical system and its stray light analysis
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摘要: 论述了红外折衍混合消热差光学系统的设计原理与方法，利用衍射光学元件特性进行消热差与色差，设计出工作波段为3.5m～5.2m、F数为2、焦距为100mm、全视场角7，具有100%冷屏效率的折衍混合消热差光学系统。对系统进行杂光分析，理想成像光线的像面辐照度为1.5104W/m2，其他非成像光线的像面辐照度为2W/m2。该系统在-50℃～80℃的温度范围内成像质量接近衍射极限，适用于像元尺寸为30m、像元数320256的致冷型红外焦平面阵列探测器。Abstract: The concept and design of infrared hybrid diffractive/refractive athermalized optical system are described. A diffractive optical element is used to athermalize and achromatize the optical system. A hybrid optical system operating at 3.5m～5.2m wave band and the temperature range of -50～80℃ is designed. The system parameters include a focal length of 100mm, F/# 2, and FOV of 3.5, and it achieves 100% cold shield efficiency. The system stray light is analyzed, and the irradiances of the desired light and the stay light are 1.5104W/m2 and 2W/m2 respectively. The image quality achieved in the temperature range of -50℃～80℃ approaches the diffraction limitation. It is applicable to a cooled FPA detector with the format of 320256 and the pixel pitch of 30m.
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Keywords:
- athermalisation /
- diffractive optics /
- optical design /
- MWIR
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