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Proceedings Paper

Optical design study and prototyping of a dual-field zoom lens imaging in the 1-5 micron infrared waveband
Author(s): Dmitry Reshidko; Pavel Reshidko; Ran Carmeli
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Paper Abstract

Optical systems can provide simultaneous imaging in several spectral bands and thus be much more useful. A new and current generation of focal plane arrays is allowing detection in more than one spectral region. The design of a refractive imaging lens for such detectors requires correcting chromatic aberrations over the wider range of wavelengths. However, the fewer available refracting materials, the material properties that change between the spectral bands, and the system transmission requirements make the design of such lenses particularly challenging. We present a dual-field zoom lens designed for a cooled detector sensing across short-wave infrared (SWIR) and midwave infrared (MWIR) spectral bands (continuous imaging for 1-5 μm). This zoom lens has a 75 mm focal length in the wide mode and a 250mm focal length in the narrow mode, and operates at f/4.7 in both discrete zoom positions. The lens is actively compensated to work in thermal environments from -20°C to +60°C. We discuss the optical design methodology, review the selection of materials and coatings for the optical elements, and analyze the transmission of the lens and optical performance. A prototype system has been manufactured and assembled. We validate our design with experimental data.

Paper Details

Date Published: 3 September 2015
PDF: 14 pages
Proc. SPIE 9580, Zoom Lenses V, 95800C (3 September 2015); doi: 10.1117/12.2187246
Show Author Affiliations
Dmitry Reshidko, The Univ. of Arizona (United States)
Pavel Reshidko, RP Optical Lab. Ltd. (Israel)
Ran Carmeli, RP Optical Lab. Ltd. (Israel)

Published in SPIE Proceedings Vol. 9580:
Zoom Lenses V
Ellis Betensky; Takanori Yamanashi, Editor(s)

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