Using Notch‐Filter Masks for High‐Contrast Imaging of Extrasolar Planets | Zendy

John H. Debes | Zendy; Jian Ge | Zendy; Marc J. Kuchner | Zendy; Michael Rogosky | Zendy

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Using Notch‐Filter Masks for High‐Contrast Imaging of Extrasolar Planets

Author(s) -

John H. Debes,

Jian Ge,

Marc J. Kuchner,

Michael Rogosky

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/420734

Subject(s) - coronagraph , optics , band stop filter , physics , exoplanet , filter (signal processing) , high dynamic range , high dynamic range imaging , starlight , planet , dynamic range , computer science , astronomy , computer vision , low pass filter , stars

We present the first laboratory experiments using a notch-filter mask, acoronagraphic image mask that can produce infinite dynamic range in an idealLyot coronagraph according to scalar diffraction theory. We fabricated thefirst notch-filter mask prototype with .25 $\micron$ precision using an e-beamlithography machine. Our initial optical tests show that the prototype masksgenerate contrast levels of 10$^{-5}$ at 3$\lambda/D$ and 10$^{-6}$ at $\sim8\lambda/D$, with a throughput of 27%. We speculate on the ``as-is''performance of such a mask in the Hubble Space Telescope.Comment: 12 pages, 4 figures, Accepted to Ap

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