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28 June 2006 Characterization of common path phase sensing for nulling interferometry
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Presented is the design of a nulling interferometer testbed which is capable of maintaining the suppression of a broadband, infrared source in the presence of external perturbations. Pathlength stability is accomplished by introducing a dispersive phase shift which allows light at a SWIR band to be used as a wavefront sensor to stabilize the nulled output of a broadband MWIR channel. Since both channels are common path, fluctuations in OPD observed with the wavefront sensor directly correlate to fluctuations of the nulling passband. Results obtained from the testbed will be useful to future nulling interferometers such as the Large Binocular Telescope Interferometer and the Terrestrial Planet Finder Interferometer which are currently being designed to aid in the search for earth-like planets outside our solar system.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter Hill, Philip Hinz, Tom McMahon, Tom Connors, and Joe Kraus "Characterization of common path phase sensing for nulling interferometry", Proc. SPIE 6268, Advances in Stellar Interferometry, 626831 (28 June 2006);

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