The JWST/NIRCam coronagraph: mask design and fabrication

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

doi:10.1117/12.826448

19 August 2009 The JWST/NIRCam coronagraph: mask design and fabrication

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

Author Affiliations +

Proceedings Volume 7440, Techniques and Instrumentation for Detection of Exoplanets IV; 74400W (2009) https://doi.org/10.1117/12.826448
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

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.

Citation Download 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, and 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); https://doi.org/10.1117/12.826448

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