Effect of wavefront error on 10^−7 contrast measurements | Zendy

Julia W. Evans | Zendy; Gary E. Sommargren | Zendy; Bruce Macintosh | Zendy; Scott Severson | Zendy; Daren Dillon | Zendy

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Effect of wavefront error on 10^−7 contrast measurements

Author(s) -

Julia W. Evans,

Gary E. Sommargren,

Bruce Macintosh,

Scott Severson,

Daren Dillon

Publication year - 2006

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.31.000565

Subject(s) - optics , wavefront , adaptive optics , contrast (vision) , interferometry , diffraction , physics , testbed , pupil , wavefront sensor , metrology , ptychography , strehl ratio , computer science , computer network

Received October 11, 2005; accepted November 10, 2005; posted December 2, 2005 (Doc. ID 65234) We have measured a contrast of 6.5 x 10(-8) from 10 to 25 lambda/D in visible light on the Extreme Adaptive Optics testbed, using a shaped pupil for diffraction suppression. The testbed was designed with a minimal number of high-quality optics to ensure low wavefront error and uses a phase-shifting diffraction interferometer for metrology. This level of contrast is within the regime needed for imaging young Jupiter-like planets, a primary application of high-contrast imaging. We have concluded that wavefront error, not pupil quality, is the limiting error source for improved contrast in our system.

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