Design of Membrane Diffractive Athermal Infrared Optical System
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摘要: 设计了一种薄膜衍射消热差红外光学系统。此光学系统口径为200 mm,焦距为200 mm,相对孔径为1,全视场角为3°,工作波段为10.7~10.9 μm。该系统采用薄膜衍射镜作为主镜,厚度为微米量级,具有口径大、重量轻的优点,解决了现有红外光学系统重量和口径无法调和的矛盾。利用含有衍射面的折衍混合透镜进行校正主镜带来的强色散,有效解决薄膜衍射主镜成像视场小、谱段范围窄等问题。采用薄膜衍射主镜、折衍混合透镜,很好地利用了衍射面良好的消热差特性,再结合透镜材料的选择,对光学系统消热差起到了良好的作用,并且,衍射面的使用为系统设计优化过程中增加了自由度。薄膜衍射消热差红外光学系统重量轻、成像质量好、消热差性能优良,在红外遥感成像探测领域具有良好的应用前景。Abstract: A membrane diffractive athermal infrared optical system is designed. The optical system has an aperture of 200 mm, a focal length of 200 mm, a relative aperture of 1, a full field angle of 3°, and a working wavelength of 10.7-10.9 μm. The system uses the membrane diffractive lens as the primary lens, with the thickness of a micron, and has the advantages of large aperture and light weight, which solves the contradiction between the weight and the aperture of the existing infrared optical system. A hybrid refractive diffractive lens with a diffractive surface is used to correct the strong dispersion of the primary lens, effectively solving the problems of small field of view and narrow spectral range of the membrane diffractive primary lens. The use of membrane diffractive primary lens and refractive diffractive hybrid lens effectively utilizes the good athermalization characteristics of the diffractive surface. Combined with the selection of lens materials, it plays a good role in the athermalization of the optical system; the use of the diffractive surface increases the degree of freedom in the process of system design optimization. Membrane diffractive athermal infrared optical system has the advantages of light weight, good imaging quality, and excellent athermalization performance, which has a good application prospect in the field of infrared remote sensing imaging detection.
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Key words:
- optical design /
- diffractive optics /
- membrane /
- athermalization
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表 1 光学系统参数
Table 1. Optical system parameters
System parameter Numerical value Wavelength band 10.7-10.9 μm Focal length 200 mm F number 1 Working temperature -50℃-+60℃ 表 2 光学系统公差
Table 2. Tolerance of optical system
Component serial number Surface serial number RMS Thickness and air separation/mm Tilt/" 1 1 0.025 ±0.02 40 2 0.025 ±0.02 40 2 1 0.025 ±0.02 40 2 0.025 ±0.02 40 3 1 0.025 ±0.02 40 2 0.025 ±0.02 40 4 1 0.025 ±0.02 40 2 0.025 ±0.02 40 5 1 0.025 ±0.02 40 2 0.025 ±0.02 40 6 1 0.025 ±0.02 40 2 0.025 ±0.02 40 7 1 0.025 ±0.02 40 2 0.025 ±0.02 40 表 3 鬼像路径信息
Table 3. Ghost image path information
Ghost image path Distance to ghost focus/mm Effective focal length/mm Marginal ray height/mm 7-5 -0.1544 7.2220 -2.1375 表 4 不同级次下主镜衍射效率
Table 4. Diffraction efficiency of primary lens at different diffraction orders
Diffraction order Diffraction efficiency -2 0.0009% -1 0.0022% +1 99.9600% +2 0.0089% +3 0.0022% -
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