Achromatic Phase Shifting: The Dispersive Approach

Details Achromatic Phase Shifting: The Dispersive Approach Achromatic Phase Shifting: The Dispersive Approach

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.522e..13b&link_type=abstract

Proceedings of GENIE - DARWIN Workshop - Hunting for Planets (ESA SP-522). 3-6 June 2002. Leiden, The Netherlands. Editor: H. La

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Scientific paper

For the detection of earth-like planets at nearby stars so called nulling interferometers are currently developed. With these synthetic aperture instruments the planet orbit is resolved and a deep null in the transmission map suppresses the starlight. This allows to perform low-resolution spectrometry on the remaining, virtually unobstructed planet light. The realization of a deep null over a broad spectral range requires achromatic phase shifting. The phase shifts needed depend on the telescope configuration and the recombination schemes. Achromatic phase shifting can be accomplished in many ways. Some of the approaches permit arbitrary phase shifts to be obtained, while others are limited to 90 or 180 degrees. At TNO TPD most efforts have been directed to a dispersive method.

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