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Proceedings Paper

Current progress on TPFI nulling architectures at Jet Propulsion Laboratory
Author(s): Robert O. Gappinger; J. Kent Wallace; Randall D. Bartos; Daniel R. Macdonald; Kenneth A. Brown
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Paper Abstract

Infrared interferometric nulling is a promising technology for exoplanet detection. Nulling research for the Terrestrial Planet Finder Interferometer has been exploring a variety of interferometer architectures at the Jet Propulsion Laboratory (JPL). Three architectures have been identified as having promise for achieving deeper broadband IR null depths. Previous nulling research concentrated on layouts using dispersive elements to achieve a quasi-achromatic phaseshift across the passband. However, use of a single glass for the dispersive phase shift method inherently limits the nulling bandwidth. JPL is researching use of multiple glass types to increase null depth and bandwidth. In order to pursue nulls over much broader wavelength regions, nondispersive interferometer architectures can be employed. Toward this end, JPL has been researching two reflective architectures as nulling interferometers. The key enabling technology for this and other nondispersive field flip architectures is single mode spatial filtering devices. We have obtained results with both pinhole spatial filtering and single mode fibers.

Paper Details

Date Published: 31 August 2005
PDF: 7 pages
Proc. SPIE 5905, Techniques and Instrumentation for Detection of Exoplanets II, 590506 (31 August 2005); doi: 10.1117/12.618700
Show Author Affiliations
Robert O. Gappinger, Jet Propulsion Lab. (United States)
J. Kent Wallace, Jet Propulsion Lab. (United States)
Randall D. Bartos, Jet Propulsion Lab. (United States)
Daniel R. Macdonald, Jet Propulsion Lab. (United States)
Kenneth A. Brown, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 5905:
Techniques and Instrumentation for Detection of Exoplanets II
Daniel R. Coulter, Editor(s)

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