NIRCam coronagraphic Lyot stop: design, fabrication, and testing

Yalan Mao; Torben B. Andersen; Tracy Kubo; Miguel Virgen; Henry Chan; Greg Feller; Lynn W. Huff; Eric Smith; Gopal Vasudevan; Steve Somerstein; Tom Jamieson; Scott Horner; John Krist; Charles A. Beichman; Carmen Barone; Ron Schmidt; Donna Levin; Steve Seymour; Douglas Kelly; Marcia J. Rieke

doi:10.1117/12.896451

28 September 2011 NIRCam coronagraphic Lyot stop: design, fabrication, and testing

Yalan Mao, Torben B. Andersen, Tracy Kubo, Miguel Virgen, Henry Chan, Greg Feller, Lynn W. Huff, Eric Smith, Gopal Vasudevan, Steve Somerstein, Tom Jamieson, Scott Horner, John Krist, Charles A. Beichman, Carmen Barone, Ron Schmidt, Donna Levin, Steve Seymour, Douglas Kelly, Marcia J. Rieke

Author Affiliations +

Proceedings Volume 8150, Cryogenic Optical Systems and Instruments XIII; 81500E (2011) https://doi.org/10.1117/12.896451
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

The NIRCam instrument on the James Webb Space Telescope (JWST) will provide a coronagraphic imaging capability to search for extrasolar planets in the 2 - 5 microns wavelength range. This capability is realized by a set of Lyot pupil stops with patterns matching the occulting mask located in the JWST intermediate focal plane in the NIRCam optical system. The complex patterns with transparent apertures are made by photolithographic process using a metal coating in the opaque region. The optical density needs to be high for the opaque region, and transmission needs to be high at the aperture. In addition, the Lyot stop needs to operate under cryogenic conditions. We will report on the Lyot stop design, fabrication and testing in this paper.

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Yalan Mao, Torben B. Andersen, Tracy Kubo, Miguel Virgen, Henry Chan, Greg Feller, Lynn W. Huff, Eric Smith, Gopal Vasudevan, Steve Somerstein, Tom Jamieson, Scott Horner, John Krist, Charles A. Beichman, Carmen Barone, Ron Schmidt, Donna Levin, Steve Seymour, Douglas Kelly, and Marcia J. Rieke "NIRCam coronagraphic Lyot stop: design, fabrication, and testing", Proc. SPIE 8150, Cryogenic Optical Systems and Instruments XIII, 81500E (28 September 2011); https://doi.org/10.1117/12.896451

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