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首页> 外文会议>International symposium on advanced optical manufacturing and testing technologies >Design of space-borne imager with wide field of view based on freeform aberration theory
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Design of space-borne imager with wide field of view based on freeform aberration theory

机译：基于自由像差理论的宽视场星载成像仪设计

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Freeform surfaces have advantages on balancing asymmetric aberration of the unobscured push-broom imager. However, since the conventional paraxial aberration theory is no longer appropriate for the freeform system design, designers are lack of insights on the imaging quality from the freeform aberration distribution. In order to design the freeform optical system efficiently, the contribution and nodal behavior of coma and astigmatism introduced by Standard Zernike polynomial surface are discussed in detail. An unobscured three-mirror optical system with 850 mm effective focal length, 20°× 2° field of view (FOV) is designed. The coma and astigmatism nodal positions are moved into the real-FOV by selecting and optimizing the Zernike terms pointedly, which has balanced the off-axis asymmetric aberration. The results show that the modulation transfer function (MTF) is close to diffraction limit, and the distortion throughout full-FOV is less than 0.25 %. At last, a computer-generated hologram (CGH) for freeform surface testing is designed. The CGH design error RMS is lower than λ/1000 at 632.8 nm, which meets the requirements for measurement.
机译：自由形式的表面在平衡未遮盖的推扫式成像仪的不对称像差方面具有优势。但是，由于常规近轴像差理论不再适用于自由形式的系统设计，因此设计人员缺乏从自由形式的像差分布中获取成像质量的见识。为了有效地设计自由形式的光学系统，详细讨论了标准Zernike多项式表面引入的彗形像差和像散的贡献和节点行为。设计了具有850 mm有效焦距，20°×2°视场（FOV）的无遮挡三镜光学系统。通过有针对性地选择和优化Zernike项，可以将昏迷和散光的节点位置移至真实的FOV中，从而平衡了离轴非对称像差。结果表明，调制传递函数（MTF）接近衍射极限，整个FOV的畸变小于0.25％。最后，设计了一种用于自由曲面测试的计算机生成的全息图（CGH）。 CGH设计误差RMS在632.8 nm时低于λ/ 1000，符合测量要求。

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