Phasing the mirror segments of the Keck telescopes II: the narrow-band phasing algorithm
Phasing the mirror segments of the Keck telescopes II: the narrow-band phasing algorithm
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DOI：
10.1364/ao.39.004706
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发表时间：
2000-09-01
期刊：
影响因子：
1.9
通讯作者：
Troy, M
中科院分区：
文献类型：
--
作者：
Chanan, G;Ohara, C;Troy, M
在之前的一篇论文中，我们描述了一种成功的技术，即宽带算法，用于将 Keck 望远镜的主镜部分定相至 30 nn 的精度。这里我们描述一种互补的窄带算法。尽管其动态范围有限，但其速度比宽带算法快得多，并且可以实现前所未有的约 6 nm 的定相精度。这两种独立技术之间的交叉检查以高度可信度验证了这两种方法。两种算法都收敛于分段主镜的边缘最小化配置，这与整体波前误差最小化配置不同，但我们证明，随着分段像差减少到零，这种区别消失。 (C) 2000 年美国光学学会 OCIS 代码：010.7350、120.5050、350.1260。
In a previous paper, we described a successful technique, the broadband algorithm, for phasing the primary mirror segments of the Keck telescopes to an accuracy of 30 nn. Here we describe a complementary narrow-band algorithm. Although it has a limited dynamic range, it is much faster than the broadband algorithm and can achieve an unprecedented phasing accuracy of approximately 6 nm. Cross checks between these two independent techniques validate both methods to a high degree of confidence. Both algorithms converge to the edge-minimizing configuration of the segmented primary mirror, which is not the same as the overall wave-front-error-minimizing configuration, but we demonstrate that this distinction disappears as the segment aberrations are reduced to zero. (C) 2000 Optical Society of America OCIS codes: 010.7350, 120.5050, 350.1260.