Fast and furious focal-plane wavefront sensing at W.M. Keck Observatory

Fast and furious focal-plane wavefront sensing at W.M. Keck Observatory
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W.M. 快速而激烈的焦平面波前传感

DOI:
10.1117/12.2596147
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发表时间:
2021
期刊:
118231E
影响因子:
--
通讯作者:
Pueyo, Laurent
Pueyo, Laurent
中科院分区:
--
文献类型:
--
作者:
Bos, Steven P.;Bottom, Michael;Ragland, Sam;Delorme, Jacques-Robert;Cetre, Sylvain;Pueyo, Laurent

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高质量、可重复的点扩散函数对于直接系外行星成像、高精度天体测量和系外行星的高分辨率光谱学等科学案例非常重要。对于这种要求苛刻的应用,由自适应光学系统提供的初始天空点扩散函数可能需要进一步优化,以校正未感测的静态像差和校准偏差。我们研究使用快速和愤怒的焦平面波前传感算法作为一个潜在的解决方案。该算法使用光学系统的简单模型和焦平面信息来测量和校正点扩散函数相位,而不使用散焦图像,这意味着它可以与科学同时运行。空中测试表明,在几次迭代中,使用窄滤波器和宽带滤波器,PSF质量得到了显着改善。这些结果表明,该算法是一个有用的路径向前创建和维护高品质,可重复的天空自适应光学点扩散函数。
High quality, repeatable point-spread functions are important for science cases like direct exoplanet imaging, high-precision astrometry, and high-resolution spectroscopy of exoplanets. For such demanding applications, the initial on-sky point-spread function delivered by the adaptive optics system can require further optimization to correct unsensed static aberrations and calibration biases. We investigated using the Fast and Furious focal-plane wavefront sensing algorithm as a potential solution. This algorithm uses a simple model of the optical system and focal plane information to measure and correct the point-spread function phase, without using defocused images, meaning it can run concurrently with science. On-sky testing demonstrated significantly improved PSF quality in only a few iterations, with both narrow and broadband filters. These results suggest this algorithm is a useful path forward for creating and maintaining high-quality, repeatable on-sky adaptive optics point-spread functions.
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