Physics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4860..361w&link_type=abstract
High-Contrast Imaging for Exo-Planet Detection. Edited by Alfred B. Schultz. Proceedings of the SPIE, Volume 4860, pp. 361-370
Physics
1
Scientific paper
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.
Hull Tony B.
Maker Paul D.
Trauger John T.
Wilson Daniel W.
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