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Proceedings Paper

The development and applications of a ground-based fiber nulling coronagraph
Author(s): Stefan Martin; Eugene Serabyn; Kurt Liewer; Frank Loya; Bertrand Mennesson; Charles Hanot; Dimitri Mawet
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Paper Abstract

A rotating nulling coronagraph has been built for use on ground-based telescopes. The system is based on the concept of sub-aperturing the pupil of the telescope with two elliptical apertures and combining the resulting two input beams on a single-mode fiber. By a relative π phase shift of the beams, the starlight can be nulled and a relatively faint companion star can be detected. Rotation of the aperture mask on the telescope pupil results in a signal similar to that expected from a space-borne telescope system such as the proposed TPF/Darwin interferometer. The design of the nulling coronagraph and the ancillary systems that are needed, such as the fringe tracker, are described and the potential for observations on telescopes such as the Palomar 200" is discussed. Results of a nulling experiment using a single mode fiber as a beam combiner for broadband light between 1.50 μm and 1.80 μm are shown.

Paper Details

Date Published: 28 July 2008
PDF: 10 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 70131Y (28 July 2008); doi: 10.1117/12.789484
Show Author Affiliations
Stefan Martin, Jet Propulsion Lab. (United States)
Eugene Serabyn, Jet Propulsion Lab. (United States)
Kurt Liewer, Jet Propulsion Lab. (United States)
Frank Loya, Jet Propulsion Lab. (United States)
Bertrand Mennesson, Jet Propulsion Lab. (United States)
Charles Hanot, AEOS, Univ. of Liege (Belgium)
Dimitri Mawet, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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