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Proceedings Paper

Eclipse apodization: realization of occulting spots and Lyot masks
Author(s): Daniel W. Wilson; Paul D. Maker; John T. Trauger; Tony B. Hull
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Paper Abstract

A key element in the Eclipse coronagraph is the apodized occulting spot. For exo-planet detection in the presence of a sun-like star, the specification for intensity transmittance at the center of the spot is less than 1×10-8. It must also taper smoothly with a desired functional form to avoid diffraction artifacts in the angular region of planet detection. From a fabrication point of view, these requirements are very challenging. A candidate technology for fabricating such spots is electron-beam exposure of high-energy beam sensitive (HEBS) glass (a product of Canyon Materials, San Diego, CA). In this work, we have calibrated HEBS glass optical density as a function of electron-beam exposure and attained optical densities up to 7.66 without saturation. We then fabricated occulting spots having various functional forms including circular Gaussian, one-dimensional sinc2, and circular sinc2. Preliminary quantitative analysis of the circular sinc2 occulting spot is encouraging.

Paper Details

Date Published: 3 March 2003
PDF: 10 pages
Proc. SPIE 4860, High-Contrast Imaging for Exo-Planet Detection, (3 March 2003); doi: 10.1117/12.457886
Show Author Affiliations
Daniel W. Wilson, Jet Propulsion Lab. (United States)
Paul D. Maker, Jet Propulsion Lab. (United States)
John T. Trauger, Jet Propulsion Lab. (United States)
Tony B. Hull, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 4860:
High-Contrast Imaging for Exo-Planet Detection
Alfred B. Schultz; Richard G. Lyon, Editor(s)

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