On the sequence of deformable mirrors in MCAO: findings from an on-sky, closed-loop experiment

On the sequence of deformable mirrors in MCAO: findings from an on-sky, closed-loop experiment
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关于 MCAO 中可变形镜子的序列:天空闭环实验的发现

DOI:
10.1117/12.2563376
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发表时间:
2020
期刊:
SPIE Astronomical Telescopes and Instrumentation
影响因子:
--
通讯作者:
Goode, Phil
Goode, Phil
中科院分区:
--
文献类型:
--
作者:
Schmidt, Dirk;Gorceix, Nicolas;Goode, Phil

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我们进行了一个天空中的MCAO实验,使用4个变形镜(DM),以分析其序列的相关性,剩余波前误差。两个DM与4和8 km共轭。另外两个DM被放置在瞳孔图像的上游和下游的4公里和8公里的镜子。在任何时候,两个高海拔DM都是活跃的,但只有一个瞳孔DM是活跃的,而另一个保持平坦。首先,我们发现使用任一光瞳DM的MCAO控制回路是稳定的和鲁棒的。对于第一瞳孔DM存在的动态配准不良对于控制器来说不是立即的问题。我们没有注意到一个明显的差异时,在操作过程中反复切换瞳孔DM。对校正图像和AO遥测中的对比度进行更仔细的分析表明,当瞳孔校正应用于高海拔DM下游的DM时,具有优势。这一发现在不同日期记录的几个数据中是一致的。然而,两者的差别很小。可能需要进行更详细的分析,以排除本文可能未考虑的错误来源,从而得出关于MCAO中DM的最佳顺序及其实际相关性的最终结论。
We performed an on-sky MCAO experiment using 4 deformable mirrors (DMs) to analyze the relevance of their sequence to the residual wavefront error. Two DMs were conjugate to 4 and 8 km. The other two DMs were placed in pupil images upstream and downstream of the 4-km and 8-km mirrors. At any time, both high altitude DMs were active but only one pupil DM was active while the other one stayed flat. Firstly, we found that the MCAO control loops using either pupil DM were stable and robust. Dynamic misregistration, which was present for the first pupil DM, was not an immediate problem for the controller. We did not notice an apparent difference when repeatedly switching between the pupil DMs during the operation. A closer analysis of the contrast in the corrected images and AO telemetry indicates an advantage when the pupil correction was applied with the DM that was downstream of the high-altitude DMs. This finding is consistent in several data recorded at different days. The difference, however, is small. A more detailed analysis is probably needed to rule out error sources potentially not considered herein to draw a final conclusion on the optimal sequence of DMs in MCAO and its practical relevance.
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