Design And Demonstration Of Band-limited Hybrid Coronagraph Masks For The Direct Imaging Of Exoplanetary Systems

Details Design And Demonstration Of Band-limited Hybrid Coronagraph Masks For The Direct Imaging Of Exoplanetary Systems Design And Demonstration Of Band-limited Hybrid Coronagraph Masks For The Direct Imaging Of Exoplanetary Systems

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21537701t&link_type=abstract

American Astronomical Society, AAS Meeting #215, #377.01; Bulletin of the American Astronomical Society, Vol. 42, p.586

Computer Science

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Scientific paper

Band-limited coronagraph masks have generally been described in terms of attenuation profiles free of phase shifts. However, phase shifts are expected and observed in physical occulting masks, with significant effects at billion-to-one contrast levels in spectrally broad light, as will be required for the direct imaging and spectroscopy of nearby exoplanet systems at visible wavelengths.
We report the design and fabrication of hybrid focal-plane masks for Lyot coronagraphy, composed of thickness-profiled metallic and dielectric thin films vacuum-deposited on a glass substrate. These masks are in principle band-limited in both the real and imaginary parts of their complex amplitude characteristics. Together with a deformable mirror for control of wavefront phase, these masks have the potential for contrast performance better than 1e-9 at inner working angles of 3 lambda/D or better over spectral bandwidths of 20% or more, and with throughput efficiencies 57% or more. We report recent laboratory demonstrations of high contrast with nickel-dielectric masks, including the demonstration of 2.7e-9 contrast with a 3 lambda/D inner working angle over a 20% spectral bandwidth.

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