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Phasing of telescope mirror segments using a fast, two-wavelength interferometer.

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Abstract

We demonstrate the combination of two-wavelength interferometry with an instantaneous phase-shift interferometer to achieve a measurement range greater than 10 mm and a resolution of a few nanometers with a single instrument. Results of measuring and phasing two mirror array segments are presented. The operational limits, calibration and accuracies of the technique are discussed.

© 2003 Optical Society of America

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