Phase closure bias versus dispersion in a stellar interferometer

Details Phase closure bias versus dispersion in a stellar interferometer Phase closure bias versus dispersion in a stellar interferometer

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003optco.216..329h&link_type=abstract

Optics Communications, Volume 216, Issue 4-6, p. 329-334.

Physics

Optics

Scientific paper

Phase closure is a well-known technique able to eliminate phase biases in a three-arm interferometer. This property is very useful to avoid the phase effect of the atmosphere in stellar interferometry. In this paper we theoretically investigate the effect of differential dispersion in a three-arm interferometer. We demonstrate that phase closure can be corrupted by differential dispersion between the interferometric arms. We begin by a general demonstration of such effect and propose a few examples where symmetry properties avoid phase closure errors. An analytical model for gaussian shaped spectrum and second order dispersion development is proposed. This analytical solution is illustrated by experimental results on a fibre version of a stellar interferometer.

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