Laboratory Testing of a Lyot Coronagraph Equipped with an Eighth-Order Notch Filter Image Mask

Details Laboratory Testing of a Lyot Coronagraph Equipped with an Eighth-Order Notch Filter Image Mask Laboratory Testing of a Lyot Coronagraph Equipped with an Eighth-Order Notch Filter Image Mask

2006-04-07

arxiv.org/abs/astro-ph/0604167v1

Astrophys.J.646:1252-1259,2006

Astronomy and Astrophysics

Astrophysics

Accepted to ApJ. 16 pages, 7 figures, Contact jcrepp@astro.ufl.edu for high resolution images

Scientific paper

10.1086/504977

We have built a series of notch filter image masks that make the Lyot coronagraph less susceptible to low-spatial-frequency optical aberrations. In this paper, we present experimental results of their performance in the lab using monochromatic light. Our tests show that these ``eighth-order'' masks are resistant to tilt and focus alignment errors, and can generate contrast levels of 2 x 10^-6 at 3 lambda/D and 6 x 10^-7 at 10 lambda/D without the use of corrective optics such as deformable mirrors. This work supports recent theoretical studies suggesting that eighth-order masks can provide the Terrestrial Planet Finder Coronagraph with a large search area, high off-axis throughput, and a practical requisite pointing accuracy.

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