Abstract

A 3-D Sagnac interferometer can null out light from an on-axis source achromatically. The 3-D Sagnac interferometer can make stable and achromatic π phase shifts, because it has a common path structure. The achromaticity of the interferometer is theoretically proved by Jones calculus. The experimental setup is constructed, and its nulling characteristics are measured to be about 106 at 5 λd for green (λ=532nm) and red (λ=633nm) laser light simultaneously. This interferometer would be very useful for the direct detection of faint extrasolar planets.

© 2009 Optical Society of America

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