Opto-mechanical design of a High Contrast Module (HCM) for HARMONI
Opto-mechanical design of a High Contrast Module (HCM) for HARMONI
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HARMONI 高对比度模块 (HCM) 的光机械设计
DOI：
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发表时间：
2018
期刊：
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通讯作者：
C. Vérinaud
中科院分区：
文献类型：
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作者：
F. Hénault;A. Carlotti;P. Rabou;Y. Magnard;E. Sradler;D. Mouillet;G. Chauvin;M. Bonnefoy;J. Sauvage;K. Dohlen;A. Vigan;T. Fusco;K. El Hadi;P. Vola;F. Clarke;N. Thatte;I. Bryson;H. Schnetler;M. Tecza;C. Vérinaud
HARMONI是ESO的极大望远镜（ELT）的第一光可见光和近红外积分场摄谱仪，该望远镜将位于智利Cerro Armazones的顶部。单共轭自适应光学（SCAO）子系统将在奈奎斯特采样的0.61 × 0.86 arcsec视场中提供衍射限制光谱图像，光谱分辨率为R=3000-20000。在仪器内部，高对比度模块（HCM）将为HARMONI添加必要的高对比度成像能力，以光谱表征年轻的巨型系外行星和盘，其通量比在距离其星星0.1-0.2英寸处低至1 e-6。HCM使用变迹光瞳日冕仪来降低衍射星光的强度并限制探测器上的动态范围，并使用内部波前传感器来校准非公共路径像差。本文首先总结了HCM的基本技术要求，然后描述了其光学和机械设计，并在可实现的对比度，图像质量和吞吐量方面提出了预期的性能。还给出了开发和测试程序的元素。
HARMONI is a first-light visible and near-IR integral field spectrograph of ESO’s Extremely Large Telescope (ELT) which will sit on top of Cerro Armazones, Chile. A Single Conjugate Adaptive Optics (SCAO) sub-system will provide diffraction-limited spectral images in a Nyquist-sampled 0.61 × 0.86 arcsec field of view, with a R=3000-20000 spectral resolution. Inside the instrument, a High Contrast Module (HCM) will add an essential high-contrast imaging capability for HARMONI to spectrally characterize young giant exoplanets and disks with flux ratio down to 1e-6 at 0.1-0.2” from their star. The HCM uses an apodized pupil coronagraph to lower the intensity of the diffracted starlight and limit the dynamic range on the detector, and an internal wavefront sensor to calibrate non-common path aberrations. This communication first summarizes the basic technical requirements of the HCM, then describes its optical and mechanical designs, and presents expected performance in terms of achievable contrast, image quality and throughput. Elements of the development and test program are also given.