Large-deviation achromatic Risley prisms pointing systems

Jean Lacoursiere; Michel Doucet; Eugene O. Curatu; Maxime Savard; Sonia Verreault; Simon Thibault; Paul C. Chevrette; Benoit Ricard

doi:10.1117/12.469192

4 June 2002 Large-deviation achromatic Risley prisms pointing systems

Jean Lacoursiere, Michel Doucet, Eugene O. Curatu, Maxime Savard, Sonia Verreault, Simon Thibault, Paul C. Chevrette, Benoit Ricard

Author Affiliations +

Proceedings Volume 4773, Optical Scanning 2002; (2002) https://doi.org/10.1117/12.469192
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

As part of the Infrared Eye project, this article describes the design of large-deviation, achromatic Risley prisms scanning systems operating in the 0.5 - 0.92 and 8 - 9.5 μm spectral regions. Designing these systems is challenging due to the large deviation required (zero - 25 degrees), the large spectral bandwidth and the mechanical constraints imposed by the need to rotate the prisms to any position in 1/30 second. A design approach making extensive use of the versatility of optical design softwares is described. Designs consisting of different pairs of optical materials are shown in order to illustrate the trade-off between chromatic aberration, mass and vignetting. Control of chromatic aberration and reasonable prism shape is obtained over 8 - 9.5 μm with zinc sulfide and germanium. The design is more difficult for the 0.5 - 0.92 μm band. Trade-offs consist in using sapphire with Cleartran® over a reduced bandwidth (0.75 - 0.9 μm ) or acrylic singlets with the Infrared Eye in active mode (0.85 - 0.86 μm). Non-sequential ray-tracing is used to study the effects of fresnelizing one element of the achromat to reduce its mass, and to evaluate detector narcissus in the 8 - 9.5 μm region.

Citation Download Citation

Jean Lacoursiere, Michel Doucet, Eugene O. Curatu, Maxime Savard, Sonia Verreault, Simon Thibault, Paul C. Chevrette, and Benoit Ricard "Large-deviation achromatic Risley prisms pointing systems", Proc. SPIE 4773, Optical Scanning 2002, (4 June 2002); https://doi.org/10.1117/12.469192

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