Physics – Optics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560401p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #604.01; Bulletin of the American Astronomical Society, Vol. 36, p.1126
Physics
Optics
Scientific paper
Direct imaging of earth-like planets from space using a two-meter class telescope requires an instrument that combines extremely high contrast over a wide bandwidth, angular resolution close to the diffraction limit of the aperture and high throughput. In theory, Phase Induced Amplitude Apodisation coronagraphs meet these performance requirements, making them very appealing for close companion searches. However, direct polishing of the aspherical optics necessary to build such a system is a challenging endeavor. Here we take advantage of the fact that for small Fresnel numbers, the prescription of PIAA optics follows closely a parabola with departures below thirty microns. In this poster we introduce a design that yields a broadband contrast of ten orders of magnitude in the absence of aberrations. We then present numerical results that illustrate the feasibility of broadband wavefront control even with a low Fresnel number design.
Balasubramanian B.
Pueyo Laurent
Shaklan Stuart B.
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