Controlling wavefront distortions across a thermal boundary

Details Controlling wavefront distortions across a thermal boundary Controlling wavefront distortions across a thermal boundary

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6267e..66h&link_type=abstract

Ground-based and Airborne Telescopes. Edited by Stepp, Larry M.. Proceedings of the SPIE, Volume 6267, pp. 626722 (2006).

Physics

Optics

2

Scientific paper

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.

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