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.
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