Physics – Optics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916410p&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #164.10; Bulletin of the American Astronomical Society,
Physics
Optics
Scientific paper
Recent progress in static wavefront compensation has both numerically and experimentally proven the feasibity of wavefront flattening very close to a level that would enable direct space based observation of exo-planets. This poster reports a novel semi-analytic approach to the influence of Fresnel propagation in pupil apodised coronagraphs and introduces a methodology to compensate for propagated wavefront aberrations under broadband illumination. We start from the Fresnel integral and derive an analytical closed form of the propagated field at an arbitrary distance from a pupil. Then we use this result in order to provide an analytical bound to the influence of propagation of the apodisation on the overall contrast level and thus quantify the required performance level of the optics . Next, we use this result to predict the wavelength dependence of an aberration that is not located at a conjugate of a pupil and use this a priori model to develop a multi-wavelength wavefront sensing scheme that takes into account Fresnel effects. Lastly, we present a series of wavefront actuators based on multiple deformable mirrors that possess the adequate chromatic behavior to correct for these aberrations.
Kasdin Jeremy
Pueyo Laurent A.
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