EDP Sciences
Free access
Volume 400, Number 1, March II 2003
Page(s) 385 - 392
Section Physical and chemical processes
DOI http://dx.doi.org/10.1051/0004-6361:20021834

A&A 400, 385-392 (2003)
DOI: 10.1051/0004-6361:20021834

Phase Knife Coronagraph

II - Laboratory results
L. Abe1, 2, A. Domiciano de Souza Jr.1, 2, F. Vakili2 and J. Gay1

1  Observatoire de la Côte d'Azur, Département Fresnel, UMR-CNRS 6528, 06460 Saint-Vallier de Thiey, France
2  UMR-6525 Astrophysique, Université de Nice Sophia-Antipolis, Parc Valrose, 06108 Nice Cedex 02, France

(Received 28 February 2002 / Accepted 25 October 2002)

We report laboratory results from a monochromatic prototype of the Phase Knife Coronagraph which validate our previous theoretical and numerical simulations, prove the physical principle of it and set realistic limitations to the nulling properties of the coronagraph. The optical set-up, phase knife manufacturing technique and different aspects of the instrumental limitations are given. The first results attain easily a 3000 nulling effect obtained both on single and simulated double stars. Optical and mechanical stabilities are discussed and future steps to be carried out for a wide band version of this coronagraph are outlined.

Key words: techniques: interferometric -- methods: laboratory -- stars: binaries: close

Offprint request: L. Abe, Lyu.Abe@unice.fr

© ESO 2003