Effect of wavefront error on 10-7 contrast measurements

Details Effect of wavefront error on 10-7 contrast measurements Effect of wavefront error on 10-7 contrast measurements

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006optl...31..565e&link_type=abstract

Optics Letters, vol. 31, Issue 5, pp.565-567

Physics

Optics

2

Adaptive Optics, Apertures

Scientific paper

We have measured a contrast of 6.5×10-8 from 10 to 25 λ/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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