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Proceedings Paper

Optical wavefront characterization using phase retrieval for the NIRSpec demonstration model for the James Webb Space Telescope
Author(s): Jeffrey S. Smith; David L. Aronstein; Pamela S. Davila; Bruce H. Dean; Bernhard Dorner; Xavier Gnata; Markus Melf; Jean-François Pittet; Maurice B. Te Plate
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Paper Abstract

Phase retrieval results are presented for the James Webb Space Telescope (JWST) Near InfraRed Spectrograph (NIRSpec) demonstration model (DM). NIRSpec is one of five science instruments (SIs) comprising the Integrated Science Instrument Module (ISIM); the NIRSpec is being built for the European Space Agency by a consortium led by EADS Astrium GmbH. During this initial DM test campaign, focal-sweep images were collected over the science field of view (FOV) for determining best focus at both ambient and cryogenic (cryo) temperature environments, and these images were then used as input to the Hybrid Diversity Algorithm (HDA) for phase retrieval, using Variable Sampling Mapping (VSM). Wavefront estimates from phase retrieval, an error budget, and diagnostics used to assess phase retrieval stability and convergence are discussed. The ambient phase retrieval results were compared against wavefront measurements taken with a Shack-Hartmann wavefront sensor.

Paper Details

Date Published: 10 August 2010
PDF: 13 pages
Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77313P (10 August 2010); doi: 10.1117/12.857755
Show Author Affiliations
Jeffrey S. Smith, NASA Goddard Space Flight Ctr. (United States)
David L. Aronstein, NASA Goddard Space Flight Ctr. (United States)
Pamela S. Davila, NASA Goddard Space Flight Ctr. (United States)
Bruce H. Dean, NASA Goddard Space Flight Ctr. (United States)
Bernhard Dorner, CRAL, Observatoire de Lyon (France)
Xavier Gnata, EADS Astrium GmbH (Germany)
Markus Melf, EADS Astrium GmbH (Germany)
Jean-François Pittet, EADS Astrium GmbH (Germany)
Maurice B. Te Plate, European Space Research and Technology Ctr. (Netherlands)


Published in SPIE Proceedings Vol. 7731:
Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann Jr.; Mark C. Clampin; Howard A. MacEwen, Editor(s)

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