Toward 1010 contrast for terrestrial exoplanet detection: demonstration of wavefront correction in a shaped-pupil coronagraph
Toward 1010 contrast for terrestrial exoplanet detection: demonstration of wavefront correction in a shaped-pupil coronagraph
复制标题
面向类地系外行星探测的 1010 对比度：整形光瞳日冕仪中波前校正的演示
DOI：
10.1117/12.672511
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发表时间：
2006
影响因子：
3.5
通讯作者：
A. Kuhnert
中科院分区：
文献类型：
--
作者：
R. Belikov;A. Give'on;J. Trauger;M. Carr;N. Kasdin;R. Vanderbei;F. Shi;K. Balasubramanian;A. Kuhnert
形瞳日冕仪（SPC）是普林斯顿大学首创的一种高对比度成像系统，用于探测太阳系外的类地行星。它被设计成在4λ/D的内部工作角下实现10-10的对比度。然而，在实践中达到这种对比度水平的一个关键要求是能够将波前相位和振幅像差分别控制在rms相位和1/1000 rms振幅中至少λ/104。此外，这必须在一个大的光谱波段内保持。喷气推进实验室（JPL）的高对比度成像试验台（HCIT）是研究高对比度成像系统和精细波前控制方法的最先进设备。它由一个真空室组成，其中包含一个可配置的日冕仪装置和Xinetics可变形镜。在本文中，我们给出了普林斯顿SPC在JPL的HCIT中的测试结果。特别是，我们展示了使用散斑消除算法实现的4x10-8对比度，并证明了这种对比度在785,836nm波长上保持不变，并且对于带宽在800nm左右的宽带光具有10%的带宽。
The Shaped Pupil Coronagraph (SPC) is a high-contrast imaging system pioneered at Princeton for detection of extra-solar earthlike planets. It is designed to achieve 10-10 contrast at an inner working angle of 4λ/D. However, a critical requirement in attaining this contrast level in practice is the ability to control wavefront phase and amplitude aberrations to at least λ/104 in rms phase and 1/1000 rms amplitude, respectively. Furthermore, this has to be maintained over a large spectral band. The High Contrast Imaging Testbed (HCIT) at the Jet Propulsion Lab (JPL) is a state-of-the-art facility for studying high contrast imaging systems and fine wavefront control methods. It consists of a vacuum chamber containing a configurable coronagraph setup with a Xinetics deformable mirror. In this paper, we present the results of testing Princeton's SPC in JPL's HCIT. In particular, we present the achievement of 4x10-8 contrast using a speckle nulling algorithm, and demonstrate that this contrast is maintained across wavelengths of 785, 836nm, and for broadband light having 10% bandwidth around 800nm.