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Open AccessArticle

Effect of Wet Expansion Behavior on Polyimide Membrane Diffractive Lens

by 1,2,*, 1, 1 and 1
1
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(9), 559; https://doi.org/10.3390/coatings9090559
Received: 6 August 2019 / Revised: 20 August 2019 / Accepted: 27 August 2019 / Published: 2 September 2019
(This article belongs to the Special Issue Design, Manufacturing and Measurement of Optical Film Coatings)
Optical polyimide (PI) membrane is a potential substrate to fabricate a diffractive primary lens in large aperture space-borne telescope. In this paper, we investigated the wet expansion behavior of PI via a strain gauge method and measured the coefficient of wet expansion (CWE) of PI membrane supported by different fixtures. The CWE of silica-fixed, ring-fixed, and free state PI membrane were near zero, 5 ppm/%, and 10 ppm/% respectively. It is found that Fresnel zone lens (FZL), based on PI membrane with lower CWE, achieve a better imaging quality with smaller wave-front errors. The underlying mechanisms and methods to improve imaging quality of ring-fixed FZL are discussed. This work provides direction in fabricating a flexible membrane diffractive lens with applicable imaging quality. View Full-Text
Keywords: optical polyimide membrane; diffractive lens; coefficient of wet expansion (CWE); wave-front errors optical polyimide membrane; diffractive lens; coefficient of wet expansion (CWE); wave-front errors
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Gao, G.; Mao, D.; Fan, B.; Guan, C. Effect of Wet Expansion Behavior on Polyimide Membrane Diffractive Lens. Coatings 2019, 9, 559.

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