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Lateral shearing with a pair of double Fresnel rhombs for nulling interferometry

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Abstract

A lateral-shearing interferometer with a pair of double Fresnel rhombs is proposed. Use of Fresnel rhombs enables us to accomplish simultaneously lateral shearing and achromatic nulling. Nulling interferometry with lateral shearing is one of the basic methods for searching directly for extrasolar planets with a segmented-mirror telescope. Here the Thirty-Meter Telescope is considered as a model of a segmented-mirror telescope. Our computer simulations show high extinction for the K-band (2.02.4μm). Optical experiments are conducted to verify the lateral shearing and nulling with a pair of double Fresnel rhombs.

© 2011 Optical Society of America

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