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Proceedings Paper

Diffraction-limited infrared zoom collimator
Author(s): Thomas H. Jamieson
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Paper Abstract

A camera zoom lens produces a constant image size at constant relative aperture, which implies a varying field of view and varying entrance pupil size during zooming. In contrast, the zoom collimator of this paper is designed for a constant field angle and constant size entrance pupil, and this implies a varying image size and varying relative aperture during zooming. The optical design and engineering of a 10 to 1 zoom ratio, 2 to 5 pm waveband, diffraction limited infrared collimator is described. The application of the zoom system was a variable magnification scene generator, used to test infrared imaging and seeker systems. Although the field of view and relative aperture are modest, namely 2 degrees and F/5 at one zoom extreme, the required image quality was very high. RMS. aberration residuals of less than 1/10 at 2 µm wavelength for all field angles and for all zoom positions, were specified. The design adopted was an eight element, all spherical silicon and germanium re-imaged configuration.

Paper Details

Date Published: 25 September 1997
PDF: 7 pages
Proc. SPIE 3129, Zoom Lenses II, (25 September 1997); doi: 10.1117/12.284235
Show Author Affiliations
Thomas H. Jamieson, Lockheed Martin Advanced Technology Ctr. (United States)

Published in SPIE Proceedings Vol. 3129:
Zoom Lenses II
Ellis I. Betensky; Allen Mann; Iain A. Neil, Editor(s)

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