Design and Lab Demonstration of the PIAA/Binary-Mask Hybrid Coronagraph

Details Design and Lab Demonstration of the PIAA/Binary-Mask Hybrid Coronagraph Design and Lab Demonstration of the PIAA/Binary-Mask Hybrid Coronagraph

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916408t&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #164.08; Bulletin of the American Astronomical Society,

Physics

Optics

Scientific paper

The PIAA (phase-induced amplitude apodization, Guyon 2003) coronagraph uses two mirrors to realize the apodization needed to for high contrast ( 1010) imaging for extrasolar planet searches. It achieves a very high throughput and a very small inner working angle (IWA) simultaneously, without being affected too much by resolved stellar disks.
However, the PIAA designed to give a 1010 contrast by itself would suffer from optics shapes that are difficult to polish, as well as the reduced bandwidth because of chromatic diffraction (Pluzhnik et al. 2006). This problem can be solved through combining classical pupil apodization (CPA) with a PIAA producing more moderate apodization. Binary-mask solutions as the CPA are especially attractive because they can make a practically achromatic coronagraph that is not hard to manufacture.
We have designed a concentric ring mask that is optimized to give an IWA of 1.2 lambda/D (in the sky) with a 75 % total throughput (as the hybrid system) for out first lab demonstration. The contrast of 106 has been achieved at a sepation of 1.5 lambda/D up to now, with a focal plane wavefront control.

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