Physics – Optics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001spie.4441...72s&link_type=abstract
Proc. SPIE Vol. 4441, p. 72-78, Current Developments in Lens Design and Optical Engineering II, Robert E. Fischer; R. Barry John
Physics
Optics
Scientific paper
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.
McCarthy Donald W.
Sarlot Roland J.
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