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Proceedings Paper

Cryogenic 1-5 micron atmospheric dispersion corrector for astronomical adaptive optics
Author(s): Roland J. Sarlot; Donald W. McCarthy
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Paper Abstract

A cryogenic mechanism has been built to correct for the blurring effects of atmospheric dispersion in adaptive-optics images from large aperture telescopes. Steward Observatory's 6.5 m telescope features a deformable Cassegrain secondary mirror compensating for atmospheric turbulence at wavelengths from 1 - 5 microns. At 1 micron, smearing caused by atmospheric dispersion equals the diffraction-limited image width (0.04 arcseconds FWHM). In order to correct for this effect and to maintain the low thermal background provided by the adaptive secondary, we have designed and built a cryogenic (77 K) atmospheric dispersion corrector. Operating over a spectral range of 1 - 5 microns, two pairs of counter-rotating calcium/lithium-fluoride prisms provide diffraction-limited imaging over a field of 1.7 arcminutes at a zenith angle up to 45 degrees.

Paper Details

Date Published: 5 December 2001
PDF: 7 pages
Proc. SPIE 4441, Current Developments in Lens Design and Optical Engineering II, (5 December 2001); doi: 10.1117/12.449571
Show Author Affiliations
Roland J. Sarlot, Steward Observatory/Univ. of Arizona (United States)
Donald W. McCarthy, Steward Observatory/Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 4441:
Current Developments in Lens Design and Optical Engineering II
Iain A. Neil; Takanori Yamanashi; Robert E. Fischer; R. Barry Johnson; Warren J. Smith, Editor(s)

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