JWST/NIRCam coronagraph: mask design and fabrication
Creators
- Krist, John E.1
- Balasubramanian, Kunjithapatham1
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Beichman, Charles A.1
- Echternach, Pierre M.1
- Green, Joseph J.1
- Liewer, Kurt M.1
- Muller, Richard E.1
- Serabyn, Eugene1
- Shaklan, Stuart B.1
- Trauger, John T.1
- Wilson, Daniel W.1
- Horner, Scott D.
- Mao, Yalan
- Somerstein, Stephen F.
- Vasudevan, Gopal
- Kelly, Douglas M.2
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Rieke, Marcia J.2
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1.
Jet Propulsion Lab
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2.
University of Arizona
Contributors
Other:
Abstract
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.
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.Attached Files
Published - 74400W.pdf
Files
74400W.pdf
Additional details
Identifiers
- Eprint ID
- 90729
- DOI
- 10.1117/12.826448
- Resolver ID
- CaltechAUTHORS:20181107-145630231
Related works
- Describes
- 10.1117/12.826448 (DOI)
Funding
- NASA/JPL/Caltech
Dates
- Created
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2018-11-07Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
Caltech Custom Metadata
- Caltech groups
- Infrared Processing and Analysis Center (IPAC) , Physics Department
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 7440