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Proceedings Paper

Controlling wavefront distortions across a thermal boundary
Author(s): Robert Hubbard; Thomas Rimmele; William Schoening; Nathan Dalrymple; Gary Poczulp; Mark Warner
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Paper Abstract

We present the details of an experimental apparatus built to explore wavefront distortion and its mitigation when an optical beam passes from one thermal environment into another. The experiment simulates a situation within the Advanced Technology Solar Telescope (ATST) baseline design where the beam travels from an ambient-temperature environment into a thermostatically controlled "room temperature" environment. We found that an 8°C temperature difference between the two environments introduces about 125 nm rms of wavefront distortion. A double air curtain (one on each side of the boundary) reduces this to about 30 nm rms. We also showed that the high-order (>1300 DoF) adaptive optics system which is integral to the ATST design will be able to further reduce this to about 5 nm rms, well within our initial error budget.

Paper Details

Date Published: 4 July 2006
PDF: 9 pages
Proc. SPIE 6267, Ground-based and Airborne Telescopes, 626722 (4 July 2006); doi: 10.1117/12.670541
Show Author Affiliations
Robert Hubbard, National Solar Observatory (United States)
Thomas Rimmele, National Solar Observatory (United States)
William Schoening, National Solar Observatory (United States)
Nathan Dalrymple, Air Force Research Lab./Sunspot (United States)
Gary Poczulp, National Optical Astronomy Observatory (United States)
Mark Warner, National Solar Observatory (United States)

Published in SPIE Proceedings Vol. 6267:
Ground-based and Airborne Telescopes
Larry M. Stepp, Editor(s)

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