Abstract

Some varieties of photonic crystal fiber (PCF) have huge potential for high-resolution imaging in astronomy. They allow us to operate in a single-mode regime over a wide bandwidth keeping a high transmission level. Thus they may be used to carry wide spectral light over hundreds of meters. We report the implementation of what we believe to be the first three-beam interferometer fitted with PCF arms. This configuration is needed to achieve high-resolution imaging. A full description of the experimental setup is given, and closure phase measurements achieved over a 1μm bandwidth are also presented. With a pointlike source, the theoretical closure phase is expected to be 0 rad. Experimentally, a mean closure phase of 0.01 rad has been measured with a 0.07 rad standard deviation. These results confirm that PCF should be used in an astronomical context.

© 2006 Optical Society of America

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