The JWST/NIRCam coronagraph: mask design and fabrication
The JWST/NIRCam coronagraph: mask design and fabrication
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JWST/NIRCam 日冕仪：掩模设计和制造
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
M. Rieke
中科院分区：
文献类型：
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作者：
J. Krist;K. Balasubramanian;C. Beichman;P. Echternach;J. Green;K. Liewer;R. Muller;E. Serabyn;S. Shaklan;J. Trauger;Daniel W. Wilson;S. Horner;Y. Mao;S. Somerstein;G. Vasudevan;D. Kelly;M. Rieke
詹姆斯·韦伯太空望远镜上的近红外照相机将提供来自λ =1-5 μm的高对比度源（如太阳系外行星和星周盘）的日冕照相成像。一个带有各种圆形和楔形掩模的Lyot日冕仪和匹配的Lyot瞳孔光阑将被实施。遮光器使用半色调二进制图案来近似灰度透射轮廓，所述半色调二进制图案包括在抗反射涂覆的蓝宝石衬底上的波长大小的金属点。掩模图案正在喷气推进实验室的微器件实验室使用电子束光刻法创建。这些掩星的样品已经在日冕测试台上成功地进行了评估。在一个单独的过程中，形成Lyot光阑的复合孔径将被沉积到光楔上。NIRCam日冕仪飞行组件预计将于今年完成。
The NIRCam instrument on the James Webb Space Telescope will provide coronagraphic imaging from λ =1-5 μm of high contrast sources such as extrasolar planets and circumstellar disks. A Lyot coronagraph with a variety of circular and wedge-shaped occulting masks and matching Lyot pupil stops will be implemented. The occulters approximate grayscale transmission profiles using halftone binary patterns comprising wavelength-sized metal dots on anti-reflection coated sapphire substrates. The mask patterns are being created in the Micro Devices Laboratory at the Jet Propulsion Laboratory using electron beam lithography. Samples of these occulters have been successfully evaluated in a coronagraphic testbed. In a separate process, the complex apertures that form the Lyot stops will be deposited onto optical wedges. The NIRCam coronagraph flight components are expected to be completed this year.