Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasp..117.1012a&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 117, Issue 835, pp. 1112-1119.
Astronomy and Astrophysics
Astronomy
13
Techniques: High Angular Resolution, Instrumentation: High Angular Resolution, Telescopes
Scientific paper
In this paper we give the principle of an achromatic Prolate Apodized Lyot Coronagraph (PALC), which uses a wavelength-dependent transmission of the entrance aperture to compensate for the chromatic effect of diffraction. For a fixed mask size, the aperture transmission must follow a prolate function of strength that is variable with the wavelength so that the coronagraph operates as a perfect PALC for each wavelength of the spectral bandwidth. The apodization must be stronger in the blue than in the red. The residual stellar light, reduced to a very low level for a small mask size, appears mainly in the red part of the spectral bandwidth. Numerical simulations are given for the perfect case, and solutions for realizing the needed wavelength-dependent transmission using a Mach-Zehnder interferometer are considered.
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