Polychromatic Wavefront Correction and Estimation at the Princeton University High-Contrast Imaging Laboratory

Details Polychromatic Wavefront Correction and Estimation at the Princeton University High-Contrast Imaging Laboratory Polychromatic Wavefront Correction and Estimation at the Princeton University High-Contrast Imaging Laboratory

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542113g&link_type=abstract

American Astronomical Society, AAS Meeting #215, #421.13; Bulletin of the American Astronomical Society, Vol. 42, p.288

Computer Science

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Scientific paper

We present experimental results for correction and estimation of aberrated wavefronts with shaped pupil coronagraphs and two deformable mirrors in series. We review the physics behind generation of symmetric dark holes in terms of a phasor representation given a first order approximation of the electric field. This phasor argument is used to show that correction can be achieved in broadband light if the second deformable mirror is forced to correct the anti-Hermitian field distributions incident in the image plane after a two-DM control algorithm has been used to correct the hermitian field distributions. This representation can then be used to prove that this type of broadband correction demands large actuator deformations, particularly by the second deformable mirror. This is used derive the limitation in bandwidth of two deformable mirrors in series given the magnitude of the aberrations in the optical system. The modifications made to our stroke minimization algorithm to reproduce the theoretical requirement that the second DM correct the anti-Hermitian field distributions is presented and we demonstrate our contrast performance as a function of wavelength over a 30% bandwidth. In addition to this, we present the experimental limitations for the current wavefront estimation algorithms to provide a reliable wavefront correction in broadband light. These results are then compared to the bandwidth performance of the stroke minimization control algorithm previously demonstrated for generating monochromatic symmetric dark holes in the image plane.
The material is based upon work supported by NASA under award No. NNX09AB96G.

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