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Analysis of a scanning pentaprism system for measurements of large flat mirrors

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Abstract

The optical surface of a large optical flat can be measured using an autocollimator and scanning pentaprism system. The autocollimator measures the slope difference between a point on the mirror and a reference point. Such a system was built and previously operated at the University of Arizona. We discuss refinements that were made to the hardware, the alignment procedure, and the error analysis. The improved system was demonstrated with a 1.6m flat mirror, which was measured to be flat to 12nm rms. The uncertainty in the measurement is only 9nm rms.

© 2007 Optical Society of America

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