An analysis of the phase dispersion in the symmetric beam combiner

Tang, Hong; Zhao, Feng

An analysis of the phase dispersion in the symmetric beam combiner

Tang, Hong; Zhao, Feng

URI: http://hdl.handle.net/2014/39333

Date: 2006-05-24

Keywords: Beam combiner; coatings; beamsplitter; dispersion; retardance

Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2006.

Citation: SPIE Astronomical Telescopes and Instrumentation, Orlando, Florida, May 24-31, 2006.

Abstract:

An astronomical beam combiner combines the two beams of starlight to form white-light fringes. It is desirable that the dispersion of the beam combiner be minimized across the observation wavelength range. We present here an analysis of the phase dispersion from coatings for a symmetric beam combiner. The sensitivity of the dispersion to a slight mismatch in beamsplitter coatings is also studied.

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