SIM PlanetQuest spectral calibration development unit beam combiner

Hong Tang

doi:10.1117/12.790533

28 July 2008 SIM PlanetQuest spectral calibration development unit beam combiner

Hong Tang

Proceedings Volume 7013, Optical and Infrared Interferometry; 70134Y (2008) https://doi.org/10.1117/12.790533
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

The beam combiner of an astronomical long-baseline interferometer combines the two beams of starlight to form white-light fringes. We describe beam combiner in the SIM PlanetQuest Spectral Calibration Development Unit (SCDU). In addition to forming white light fringes, the beam combiner provides other functions such as separating the light for guiding, fringe tracking, and science measurement. It is designed to function over the optical bandpass 450-950 nm. Coating design is critical to beam combiner as residual dispersion and mismatches affect the ability to accurately measure the position of stars of varying spectral types.

Citation Download Citation

Hong Tang "SIM PlanetQuest spectral calibration development unit beam combiner", Proc. SPIE 7013, Optical and Infrared Interferometry, 70134Y (28 July 2008); https://doi.org/10.1117/12.790533

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