Laboratory Demonstration of the PIAA/Binary-Mask Hybrid Coronagraph

Details Laboratory Demonstration of the PIAA/Binary-Mask Hybrid Coronagraph Laboratory Demonstration of the PIAA/Binary-Mask Hybrid Coronagraph

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confq..41t&link_type=abstract

Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s

Physics

Optics

1

Scientific paper

The PIAA(phase-induced amplitude apodization, Guyon 2003) coronagraph uses two mirrors to realize the apodization needed for high contrast 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 or telescope tip-tilt errors. However, the PIAA designed to give high contrast by itself would suffer from optics shapes that are difficult to polish, as well as the reduced bandwidth because of chromatic diffraction. Both these problems can be simultaneously solved by adopting a hybrid PIAA design (Pluzhnik et al. 2006), where the apodization created by the two-mirror system is made moderate combining a classical apodizer with PIAA apodization. We report here the implementation of a hybrid PIAA system with properly designed binary apodization masks, and show in the laboratory that such a combination is a robust approach to high contrast imaging. Thanks to thermal stabilization and mechanical isolation of the whole PIAA optics, the image drift on the final focus is kept quite small (` a few pixels in 1-2 hours). Under this stability, standard speckle nulling technique successfully killed broad speckles in half the image plane, and the contrast reached 6.5 ~10^(-7) at a separation of 1.5 lambda/D.

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