Using notch filter masks for high-contrast imaging of extra solar planets

Details Using notch filter masks for high-contrast imaging of extra solar planets Using notch filter masks for high-contrast imaging of extra solar planets

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.5170...57d&link_type=abstract

Techniques and Instrumentation for Detection of Exoplanets. Edited by Coulter, Daniel R. Proceedings of the SPIE, Volume 5170,

Computer Science

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Scientific paper

We present the first lab experiments using a notch filter mask, a coronagraphic mask that dims the light from an on-axis source while passing off-axis light unscathed. The notch filter mask is essentially an optimized Lyot coronagraph that diffracts all of the light from the central object into a small ring that can be blocked by a Lyot stop. Notch filter masks provide a high throughput, very high contrast alternative to traditional Lyot coronagraphs. These masks, like all methods for achieving high contrast, require a high amount of accuracy in design to be successful. Nanofabrication techniques can meet these design challenges; with the first notch filter mask prototype fabricated with .25 μm precision using an e-beam lithography machine. When placed in a test bed, initial results show that 10-5 contrast is achieved at 3λ/Δ and 10-6 at ~8λ/Δ with a throughput of 27%. The coronagraph rejects light from the point source's peak by at least 4 orders of magnitude despite leakage of light through the mask. We speculate on the "as-is" performance of such a mask in the Hubble Space Telescope.

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