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JWST/NIRCam coronagraph: mask design and fabrication

Krist, John E. and Balasubramanian, Kunjithapatham and Beichman, Charles A. and Echternach, Pierre M. and Green, Joseph J. and Liewer, Kurt M. and Muller, Richard E. and Serabyn, Eugene and Shaklan, Stuart B. and Trauger, John T. and Wilson, Daniel W. and Horner, Scott D. and Mao, Yalan and Somerstein, Stephen F. and Vasudevan, Gopal and Kelly, Douglas M. and Rieke, Marcia J. (2009) JWST/NIRCam coronagraph: mask design and fabrication. In: Techniques and Instrumentation for Detection of Exoplanets IV. Proceedings of SPIE. No.7440. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 74400W. ISBN 9780819477309.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Beichman, Charles A.0000-0002-5627-5471
Rieke, Marcia J.0000-0002-7893-6170
Additional Information:© 2009 Society of Photo-optical Instrumentation Engineers (SPIE). The research described in this publication was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:NIRCam, JWST, James Webb Space Telescope, coronagraph
Series Name:Proceedings of SPIE
Issue or Number:7440
Record Number:CaltechAUTHORS:20181107-145630231
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Official Citation:John E. Krist, Kunjithapatham Balasubramanian, Charles A. Beichman, Pierre M. Echternach, Joseph J. Green, Kurt M. Liewer, Richard E. Muller, Eugene Serabyn, Stuart B. Shaklan, John T. Trauger, Daniel W. Wilson, Scott D. Horner, Yalan Mao, Stephen F. Somerstein, Gopal Vasudevan, Douglas M. Kelly, Marcia J. Rieke, } "The JWST/NIRCam coronagraph: mask design and fabrication", Proc. SPIE 7440, Techniques and Instrumentation for Detection of Exoplanets IV, 74400W (19 August 2009); doi: 10.1117/12.826448;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90729
Deposited By: Tony Diaz
Deposited On:07 Nov 2018 23:29
Last Modified:04 Nov 2019 22:32

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