Design and Demonstration of Hybrid Lyot Coronagraph Masks for High-Contrast Imaging of Exoplanet Systems from Space

Details Design and Demonstration of Hybrid Lyot Coronagraph Masks for High-Contrast Imaging of Exoplanet Systems from Space Design and Demonstration of Hybrid Lyot Coronagraph Masks for High-Contrast Imaging of Exoplanet Systems from Space

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345108m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #451.08; Bulletin of the American Astronomical Society, Vol. 41, p.345

Computer Science

Performance

Scientific paper

Coronagraph focal-plane occulting masks have generally been described as attenuation profiles free of any phase shift. However, phase shifts are expected and observed in physical masks, and they impose significant limitations on coronagraph contrast at the billion-to-one contrast levels in spectrally broad light, as required for the direct imaging of planetary systems orbiting the nearby stars. These masks, composed of superimposed metallic and dielectric thin films on a glass substrate, are in principle band-limited in both the real and imaginary parts of the mask characteristics. We explore the available trades between contrast, inner working angle, spectral bandwidth, and efficiency. Together with a deformable mirror for control of wavefront phase, these masks offer significantly better performance than the classical Lyot mask. For example, we describe a hybrid mask with contrast better than 5e-10 at an inner working angle of 3 lambda/D over a spectral bandwidth of 20% with throughput efficiency of 57%. We report recent progress with the design, fabrication, and laboratory coronagraph demonstrations of these masks.

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