Diffraction-limited High Dynamic Range Imaging from the Visible to the Infrared

Details Diffraction-limited High Dynamic Range Imaging from the Visible to the Infrared Diffraction-limited High Dynamic Range Imaging from the Visible to the Infrared

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confr..42k&link_type=abstract

Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s

Astronomy and Astrophysics

Astrophysics

Scientific paper

We propose a novel technique to achieve high angular resolution imaging at high dynamic range that will be well adapted to some astrophysical cases such as imaging of planets very close to their central star and of structures in disks. The fundamental idea is to apply techniques developed for long baseline interferometry to the case of a single-aperture telescope. The pupil of the telescope is broken down into coherent sub-apertures each feeding a single-mode fiber. A remapping of the exit pupil allows interfering all sub-apertures non-redundantly. A diffraction-limited image with very high dynamic range is reconstructed from the fringe pattern analysis with aperture synthesis techniques, free of speckle noise. Raw dynamic ranges of a million can be obtained in only a few tens of seconds of integration time for bright objects and can be improved with off-line processing techniques. The technique can be applied to either visible or infrared wavelengths, the number of fibers matches the number of coherent patches over the pupil. The technique can also be applied to space coronography. First simulations show that contrasts of 10^10 can be achieved within a distance of a fraction of lambda/D on regular brightness candidates for planet search.

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