[SPIE]Experimental demonstration of laser tomographic adaptive optics on a 30-meter telescope at 800 nm

发布者:系统管理员发布时间:2010-09-10浏览次数:6352

篇名

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

论文来源
SPIE
供稿人
王兵
作者
DOI
10.1117/12.857873
日期
15 July 2010
摘要
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.

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