Requirements on optical density and phase dispersion of imperfect band-limited occulting masks in a broadband coronagraph

Details Requirements on optical density and phase dispersion of imperfect band-limited occulting masks in a broadband coronagraph Requirements on optical density and phase dispersion of imperfect band-limited occulting masks in a broadband coronagraph

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apopt..46.7485s&link_type=abstract

Applied Optics IP, vol. 46, Issue 30, pp.7485-7493

Physics

Optics

1

Telescopes, Systems Design

Scientific paper

We investigate the effects of the parasitic phase of imperfect band-limited occulting masks on the broadband contrast performance of a high-contrast imaging system through modeling and simulations. We also examine the effects of the phase and the optical-density dispersions of occulting masks whose parasitic phase has been compensated at the center wavelength but is nonzero at other wavelengths. Two types of occulting masks are considered: gray-scale masks such as those made on a high-energy beam-sensitive glass, and recently proposed spatially profiled metal masks, both having 1D Sinc2(linear-Sinc2) amplitude transmission coefficient (Sinc4 intensity transmittance) profiles. We determine the conditions for obtaining 1×10-9 and 1×10-10 contrast values with a light centered at a 785 nm wavelength and having a 10% bandwidth in a coronagraphic telescope having ideal optical surfaces but imperfect band-limited image-plane occulting masks.

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