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Proceedings Paper

Design of compact apochromatic lens with very-broad spectrum and high resolution
Author(s): Aqi Yan; Jianzhong Cao; Jian Zhang; Zhi Zhang; Hao Wang; Dengshan Wu; Zuofeng Zhou; Kaisheng Zhang; Yangjie Lei
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Paper Abstract

This paper designs a compact apochromatic lens with long focal length, which operates over very-broad spectrum from 400nm to 900nm for high resolution image application. The focal length is 290mm, and F-number is 4.5.In order to match CCD sensor, lens resolution must be higher than 100lp/mm. It is a significant challenge to correct secondary spectrum over very-broad spectrum for this application. The paper firstly pays much attention on dispersion characteristic of optical materials over this very-broad spectrum, and dispersion characteristic of glasses is analyzed. After properly glasses combinations and optimal lens structure selected, this compact apochromatic lens is designed. The lens described in this paper comprises fewer lenses, most of them are ordinary optical materials, and only one special flint type TF3 with anomalous dispersion properties is used for secondary spectrum correction. Finally, the paper shows MTF and aberration curve for performance evaluation. It can be seen that MTF of the designed lens nearly reach diffraction limit at Nyquist frequency 100lp/mm, and residual secondary spectrum is greatly reduced to less than 0.03mm (in the lines 550nm and 787.5nm). The overall length of this compact apochromatic lens is just 0.76 times its focal length, and because of fewer lenses and ordinary optical materials widely used, production cost is also greatly reduced.

Paper Details

Date Published: 11 September 2013
PDF: 7 pages
Proc. SPIE 8907, International Symposium on Photoelectronic Detection and Imaging 2013: Infrared Imaging and Applications, 89070A (11 September 2013); doi: 10.1117/12.2030546
Show Author Affiliations
Aqi Yan, Xi'an Institute of Optics and Precision Mechanics (China)
Jianzhong Cao, Xi'an Institute of Optics and Precision Mechanics (China)
Jian Zhang, Xi'an Institute of Optics and Precision Mechanics (China)
Zhi Zhang, Xi'an Institute of Optics and Precision Mechanics (China)
Hao Wang, Xi'an Institute of Optics and Precision Mechanics (China)
Dengshan Wu, Xi'an Institute of Optics and Precision Mechanics (China)
Zuofeng Zhou, Xi'an Institute of Optics and Precision Mechanics (China)
Kaisheng Zhang, Xi'an Institute of Optics and Precision Mechanics (China)
Yangjie Lei, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 8907:
International Symposium on Photoelectronic Detection and Imaging 2013: Infrared Imaging and Applications
Haimei Gong; Zelin Shi; Qian Chen; Jin Lu, Editor(s)

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