Mathematics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5487.1383c&link_type=abstract
Optical, Infrared, and Millimeter Space Telescopes. Edited by Mather, John C. Proceedings of the SPIE, Volume 5487, pp. 1383-
Mathematics
Scientific paper
We report progress on development of a new generation of binary band-limited coronagraphic image masks at Penn State for extremely high contrast imaging of extrasolar planets with future visible Terrestrial Planet Finder (TPF). The masks are being precisely fabricated with a state-of-the-art E-beam lithographer using ~20 nm precision and are capable of achieving contrasts of 10-9 with high throughput (> 40%) and close inner working distance (3 λ/D). A prototype with 250 nm precision has allowed us to reach ~10-6 contrast at 8 λ/D and 10-5 at 3 λ/D with ~27% throughput (Debes et al. 2004).
Crepp Justin
Debes John H.
Ge Jian
Kuchner Marc J.
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