Whack-a-speckle: focal plane wavefront sensing in theory and practice with a deformable secondary mirror and 5-micron camera

Matthew A. Kenworthy; Philip M. Hinz; J. Roger P. Angel; Ari N. Heinze; Suresh Sivanandam

doi:10.1117/12.672577

28 June 2006 Whack-a-speckle: focal plane wavefront sensing in theory and practice with a deformable secondary mirror and 5-micron camera

Matthew A. Kenworthy, Philip M. Hinz, J. Roger P. Angel, Ari N. Heinze, Suresh Sivanandam

Author Affiliations +

Proceedings Volume 6272, Advances in Adaptive Optics II; 62723B (2006) https://doi.org/10.1117/12.672577
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

Long exposures from adaptive optic systems show a diffraction limited core superimposed on a halo of uncorrected light from a science target, and the addition of various long-lived speckles that arise from uncorrected aberrations in the telescope system. The presence of these speckles limit the detection of extra-solar planets at a few diffraction widths from the primary source. Focal plane wavefront sensing uses the deformable secondary mirror of the MMT adaptive optics system to systematically remove the presence of long-lived speckles in a high-contrast image, and also test for the incoherent source that represents a separate astronomical target nearby. We use the Clio 5 micron camera (with its coronagraphic capabilities) to modulate long lived speckles and present initial on-sky results of this technique.

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Matthew A. Kenworthy, Philip M. Hinz, J. Roger P. Angel, Ari N. Heinze, and Suresh Sivanandam "Whack-a-speckle: focal plane wavefront sensing in theory and practice with a deformable secondary mirror and 5-micron camera", Proc. SPIE 6272, Advances in Adaptive Optics II, 62723B (28 June 2006); https://doi.org/10.1117/12.672577

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