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Optical Design of Free-Form Surface Two-Mirror Telescopic Objective with Ultra Wide Field of View

机译:具有超宽视野的自由曲面双镜伸缩物镜的光学设计

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Compact off-axial two-mirror fore objective with an ultra wide ground coverage and for spaceborne pushbroom imaging spectrometers is studied and designed. Based on Gaussian optics and Young's formulas, the approach to determine its initial structural parameters is presented. In order to meet the required performance, freeform surfaces are used to increase the degree of freedom of our optimization. And the impact of various X-Y polynomials on its pupil aberration is analyzed for elimination of too large smile effect. As an example, an off-axis two-mirror fore telescopic objective with field of view of 108° across-pushbroom direction, F number of 10, focal length of 34 mm and working wavelength range from 0.27 to 2.4 μm is optimally designed, which both the primary and the secondary mirrors have freeform surface. The designed lens has many advantages of simple and compact structure, imagery telecentricity, near diffraction-limited imaging quality, and small smile effect.
机译:研究并设计了紧凑的离轴两镜前物镜,该物镜具有超宽的地面覆盖范围,适用于星载推扫式成像光谱仪。基于高斯光学和杨氏公式,提出了确定其初始结构参数的方法。为了满足所需的性能,可使用自由曲面来增加优化的自由度。并分析了各种X-Y多项式对其瞳孔像差的影响,以消除过大的笑脸效果。例如,最佳设计了跨蘑菇方向的视场为108°,F值为10,焦距为34 mm,工作波长范围为0.27至2.4μm的离轴双镜前视物镜,主镜和副镜都具有自由曲面。设计好的镜头具有结构简单紧凑,成像远心,接近衍射极限成像质量和微笑效果小等诸多优点。

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