Picometer differential-phase measurements in the laboratory

Gautam Vasisht; E. Robert Ligon; Erik E. Bloemhof; M. Mark Colavita

doi:10.1117/12.672619

28 June 2006 Picometer differential-phase measurements in the laboratory

Gautam Vasisht, E. Robert Ligon, Erik E. Bloemhof, M. Mark Colavita

Author Affiliations +

Proceedings Volume 6268, Advances in Stellar Interferometry; 62682X (2006) https://doi.org/10.1117/12.672619
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

We describe the results of laboratory experiments, using a mock-up stellar interferometer equipped with specialized hardware, undertaken to measure differential-phase to considerable precision (0.1 mrad) over an octave of bandwidth in the infrared. Differential-phase is a precision technique that can detect subtle temporal changes in the relative (color-dependent) photocenter of an astronomical target - making it useful for direct detection of some hot-Jupiter planets from the ground. The set up described herein was built as part of the Keck Interferometer project.

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Gautam Vasisht, E. Robert Ligon, Erik E. Bloemhof, and M. Mark Colavita "Picometer differential-phase measurements in the laboratory", Proc. SPIE 6268, Advances in Stellar Interferometry, 62682X (28 June 2006); https://doi.org/10.1117/12.672619

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