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Proceedings Paper

James Webb Space Telescope Optical Simulation Testbed II: design of a three-lens anastigmat telescope simulator
Author(s): Élodie Choquet; Olivier Levecq; Mamadou N'Diaye; Marshall D. Perrin; Rémi Soummer
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Paper Abstract

The JamesWebb Space Telescope (JWST) Optical Simulation Testbed (JOST) is a tabletop experiment designed to reproduce the main aspects of wavefront sensing and control (WFS and C) for JWST. To replicate the key optical physics of JWST’s three-mirror anastigmat (TMA) design at optical wavelengths we have developed a three-lens anastigmat optical system. This design uses custom lenses (plano-convex, plano-concave, and bi-convex) with fourth-order aspheric terms on powered surfaces to deliver the equivalent image quality and sampling of JWST NIRCam at the WFS and C wavelength (633 nm, versus JWST’s 2.12 μm). For active control, in addition to the segmented primary mirror simulator, JOST reproduces the secondary mirror alignment modes with five degrees of freedom. We present the testbed requirements and its optical and optomechanical design. We study the linearity of the main aberration modes (focus, astigmatism, coma) both as a function of field point and level of misalignments of the secondary mirror. We find that the linearity with the transmissive design is similar to what is observed with a traditional TMA design, and will allow us to develop a linear-control alignment strategy based on the multi-field methods planned for JWST.

Paper Details

Date Published: 28 August 2014
PDF: 14 pages
Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91433T (28 August 2014); doi: 10.1117/12.2056931
Show Author Affiliations
Élodie Choquet, Space Telescope Science Institute (United States)
Olivier Levecq, Space Telescope Science Institute (United States)
Institut d'Optique Graduate School (France)
Mamadou N'Diaye, Space Telescope Science Institute (United States)
Marshall D. Perrin, Space Telescope Science Institute (United States)
Rémi Soummer, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 9143:
Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann; Mark Clampin; Giovanni G. Fazio; Howard A. MacEwen, Editor(s)

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