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Proceedings Paper

Experimental demonstration of laser tomographic adaptive optics on a 30-meter telescope at 800 nm
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Paper Abstract

A critical goal in the next decade is to develop techniques that will extend Adaptive Optics correction to visible wavelengths on Extremely Large Telescopes (ELTs). We demonstrate in the laboratory the highly accurate atmospheric tomography necessary to defeat the cone effect on ELTs, an essential milestone on the path to this capability. We simulate a high-order Laser Tomographic AO System for a 30-meter telescope with the LTAO/MOAO testbed at UCSC. Eight Sodium Laser Guide Stars (LGSs) are sensed by 99x99 Shack-Hartmann wavefront sensors over 75". The AO system is diffraction-limited at a science wavelength of 800 nm (S ~ 6-9%) over a field of regard of 20" diameter. Openloop WFS systematic error is observed to be proportional to the total input atmospheric disturbance and is nearly the dominant error budget term (81 nm RMS), exceeded only by tomographic wavefront estimation error (92 nm RMS). The total residual wavefront error for this experiment is comparable to that expected for wide-field tomographic adaptive optics systems of similar wavefront sensor order and LGS constellation geometry planned for Extremely Large Telescopes.

Paper Details

Date Published: 15 July 2010
PDF: 10 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 773626 (15 July 2010); doi: 10.1117/12.857873
Show Author Affiliations
S, Mark Ammons, Steward Observatory, The Univ. of Arizona (United States)
Luke Johnson, Univ. of California, Santa Cruz (United States)
Renate Kupke, Univ. of California, Santa Cruz (United States)
Donald T. Gavel, Univ. of California, Santa Cruz (United States)
Claire E. Max, Univ. of California, Santa Cruz (United States)


Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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