Hickson Paul
Department of Physics and Astronomy, The University of British Columbia, Vancouver, Canada.
Opt Lett. 2006 Jul 15;31(14):2127-9. doi: 10.1364/ol.31.002127.
Atmospheric turbulence in the internal light path of a telescope produces noncommon path phase differences that degrade the image quality of adaptive-optics systems employing laser guide stars. The spatial covariance and rms wavefront errors produced by this effect are derived. It is found that the tilt-removed wavefront error ranges from about 12 nm for a representative 30 m telescope to 59 nm for a 100 m telescope of similar optical design. For adaptive-optics systems that aim to derive tip-tilt information from the laser guide stars the error is considerably larger, ranging from 22 nm for the 30 m telescope to 256 nm for the 100 m telescope. This effect can be a significant impediment to the performance of such systems.
望远镜内部光路中的大气湍流会产生非共路相位差，从而降低采用激光导星的自适应光学系统的图像质量。推导了由此效应产生的空间协方差和均方根波前误差。结果发现，对于具有代表性的30米望远镜，去除倾斜后的波前误差范围约为12纳米；对于光学设计类似的100米望远镜，该误差范围为59纳米。对于旨在从激光导星获取倾斜信息的自适应光学系统，误差要大得多，30米望远镜的误差为22纳米，100米望远镜的误差为256纳米。这种效应可能会严重阻碍此类系统的性能。
