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- W2017193402 abstract "The traditional approach to designing a high-performance, apochromatic, telescope objective has always required the incorporation of an abnormal dispersion glass or crystal. These materials are notorious for their high cost and poor mechanical properties. Recently, some optical liquids have been found that have dispersion properties unequaled by any known glass or crystal. This has opened the way to lower-cost apochromatic objectives. While many of the problems associated with the use of traditional abnormal dispersion materials can be avoided, the incorporation of an abnormal dispersion liquid 'element' in combination with common (normal dispersion) glasses in a telescope objective design creates some unique design considerations. In this paper, a comparison of the dispersion characteristics of glasses and liquids are presented. Also presented are specific design examples that illustrate the performance improvements possible with glass-liquid combinations. The problems associated with obtaining high precision refractive index measurements on liquids and a comparison of liquid catalog and measured indices are discussed. Finally, some design issues unique to liquid lenses such as athermalization, sealing, volumetric expansion accommodation, freezing, and long-term stability are addressed." @default.
- W2017193402 created "2016-06-24" @default.
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- W2017193402 date "1991-11-01" @default.
- W2017193402 modified "2023-09-23" @default.
- W2017193402 title "Designing apochromatic telescope objectives with liquid lenses" @default.
- W2017193402 doi "https://doi.org/10.1117/12.48306" @default.
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