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Design optimization and lab demonstration of ZELDA, a Zernike sensor for near-coronagraph quasi-static measurements

机译:ZELDA的设计优化和实验室演示,ZELDA是用于近日冕仪准静态测量的Zernike传感器

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The exoplanet direct imagers Gemini/GPI and VLT/SPHERE are built around extreme adaptive optics (ExAO) to correct the atmospheric turbulence and the aberrations associated with the optical surfaces. However, additional strategies are necessary to correct the non-common path aberrations (NCPA) between the ExAO and science paths that can limit the instrument contrast performance. To perform an adequate calibration, we have developed ZELDA, a Zernike sensor to achieve NCPA measurements with nanometric accuracy. We report the results of a new design analysis that maximizes the dynamic range, and from laboratory demonstrations on the LAM high-contrast testbed and on VLT/SPHERE during its integration.
机译:系外行星直接成像仪Gemini / GPI和VLT / SPHERE围绕极端自适应光学系统(ExAO)构建,以校正大气湍流和与光学表面相关的像差。但是,必须采取其他策略来纠正ExAO和科学路径之间的非公共路径像差(NCPA),这会限制仪器的对比度性能。为了进行适当的校准,我们开发了ZELDA,这是一种Zernike传感器,可以实现纳米级精度的NCPA测量。我们报告了最大化动态范围的新设计分析的结果,以及在集成过程中在LAM高对比度测试台和VLT / SPHERE上进行的实验室演示。

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