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Proceedings Paper

The JWST/NIRCam coronagraph: mask design and fabrication
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Paper 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.

Paper Details

Date Published: 20 August 2009
PDF: 10 pages
Proc. SPIE 7440, Techniques and Instrumentation for Detection of Exoplanets IV, 74400W (20 August 2009); doi: 10.1117/12.826448
Show Author Affiliations
John E. Krist, Jet Propulsion Lab. (United States)
Kunjithapatham Balasubramanian, Jet Propulsion Lab. (United States)
Charles A. Beichman, Jet Propulsion Lab. (United States)
Pierre M. Echternach, Jet Propulsion Lab. (United States)
Joseph J. Green, Jet Propulsion Lab. (United States)
Kurt M. Liewer, Jet Propulsion Lab. (United States)
Richard E. Muller, Jet Propulsion Lab. (United States)
Eugene Serabyn, Jet Propulsion Lab. (United States)
Stuart B. Shaklan, Jet Propulsion Lab. (United States)
John T. Trauger, Jet Propulsion Lab. (United States)
Daniel W. Wilson, Jet Propulsion Lab. (United States)
Scott D. Horner, Lockheed Martin Space Systems Co. (United States)
Yalan Mao, Lockheed Martin Space Systems Co. (United States)
Stephen F. Somerstein, Lockheed Martin Space Systems Co. (United States)
Gopal Vasudevan, Lockheed Martin Space Systems Co. (United States)
Douglas M. Kelly, Univ. of Arizona (United States)
Marcia J. Rieke, Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 7440:
Techniques and Instrumentation for Detection of Exoplanets IV
Stuart B. Shaklan, Editor(s)

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