Deformable Mirror configuration in MCAO: is propagation a fundamental limit on visible wavelength correction?
Deformable Mirror configuration in MCAO: is propagation a fundamental limit on visible wavelength correction?
复制标题
MCAO 中的可变形镜配置：传播是可见光波长校正的基本限制吗？
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
R. Wilson
中科院分区：
文献类型：
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作者：
O. Farley;J. Osborn;T. Morris;A. Reeves;R. Wilson
为了使用多共轭自适应光学 (MCAO) 系统实现最佳校正，必须考虑可变形镜的顺序。由于大气湍流是从高空到低空采样的，因此后续的相位校正必须以对称的方式（低空到高空）进行，以避免光学传播通过系统而产生像差。这是太阳能 MCAO 中的一个众所周知的问题，但是以这种方式排序 DM 需要笨重的中继光学器件，因此大多数用于夜间天文学的后焦 MCAO 系统都是按照从高空到低空排序的 DM 来设计的。我们表明，这会导致一个小的波前误差，在可见光中可能变得不可忽略。采用与地面共轭的自适应次镜有可能减轻这种影响。
To achieve the best correction using a multi-conjugate adaptive optics (MCAO) system, the sequence of the deformable mirrors must be taken into account. Since atmospheric turbulence is sampled from high to low altitude, the subsequent phase corrections must be performed in a symmetrical way (low to high altitude) to avoid aberration arising from optical propagation through the system. This is a well known problem in solar MCAO however ordering the DMs in this way requires bulky relay optics, therefore most post focal MCAO systems for night-time astronomy have been designed with the DMs ordered from high to low altitude. We show that this results in a small wavefront error that can become nonnegligible in the visible. Employing an adaptive secondary mirror conjugated to the ground has the potential to alleviate this effect.