Wavefront amplitude errors for a TPF coronagraph: their effects and possible correction

Roger P. Linfield

doi:10.1117/12.549290

12 October 2004 Wavefront amplitude errors for a TPF coronagraph: their effects and possible correction

Roger P. Linfield

Proceedings Volume 5487, Optical, Infrared, and Millimeter Space Telescopes; (2004) https://doi.org/10.1117/12.549290
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

Successful planet searches with a Terrestrial Planet Finder (TPF) coronagraph will require a highly uniform wavefront, in both phase and amplitude. Requirements for phase and amplitude uniformity are derived. A Deformable Mirror (DM) can achieve broadband correction of phase errors across the full observing band. Correction of amplitude errors with a DM is also possible, but only over half the image plane, and only for a limited bandwidth. For a 500-600 nm observing band, use of a DM can relax the reflectivity uniformity requirements on TPF mirrors by a factor of 10-15, and these relaxed requirements appear to be within the current capability for mirror coatings.

Citation Download Citation

Roger P. Linfield "Wavefront amplitude errors for a TPF coronagraph: their effects and possible correction", Proc. SPIE 5487, Optical, Infrared, and Millimeter Space Telescopes, (12 October 2004); https://doi.org/10.1117/12.549290

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