Characterization of common path phase sensing for nulling interferometry

Peter Hill, Philip Hinz, Tom McMahon, Tom Connors, Joe Kraus

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


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.

Original languageEnglish (US)
Title of host publicationAdvances in Stellar Interferometry
StatePublished - Oct 6 2006
EventAdvances in Stellar Interferometry - Orlando, FL, United States
Duration: May 25 2006May 30 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6268 II
ISSN (Print)0277-786X


OtherAdvances in Stellar Interferometry
Country/TerritoryUnited States
CityOrlando, FL


  • Broadband nulling
  • Common path
  • Dispersive phase shift
  • Nulling inteferometry
  • Pathlength control
  • Wavefront sensor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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