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Achromatic hybrid triplet objective on one-only glass

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The possibility of chromatic aberration correction in a hybrid (refractive – diffractive) objective is investigated. Such objective is composed of refractive lens (or lenses) and a diffractive microstructure deposited on any of the objective surfaces. To satisfy the achromatisation condition it is enough to use one glass and a diffractive corrector, however thanks to splitting the refractive component onto two separate lenses made of the same glass we have additional possibilities to correct better monochromatic aberrations.

In this paper conditions for such design are discussed and exemplary triplet objectives are designed. The presented objectives have relative aperture as high as 1:2.5 or 1:3 and maximum field-of-view angle 7.5° or 15° respectively.

Document Type: Research Article


Affiliations: Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, PL 50-370 Wrocław, Poland

Publication date: 2004-02-01

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