Diffraction-limited infrared zoom collimator

Thomas H. Jamieson

doi:10.1117/12.284235

25 September 1997 Diffraction-limited infrared zoom collimator

Thomas H. Jamieson

Proceedings Volume 3129, Zoom Lenses II; (1997) https://doi.org/10.1117/12.284235
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

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.

Citation Download Citation

Thomas H. Jamieson "Diffraction-limited infrared zoom collimator", Proc. SPIE 3129, Zoom Lenses II, (25 September 1997); https://doi.org/10.1117/12.284235

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