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Vibration insensitive extended range interference microscopy

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Abstract

Using a simultaneous phase sensor, the proposed instrument performs highly repeatable measurements over an extended range in the presence of vibration common to a laboratory setting. Measurement of a 4.5 μm step standard in the presence of vibration amplitudes of 40 nm produces a repeatability of 1.5 nm RMS with vertical scanning data acquired at 400 nm intervals. The outlined method demonstrates the potential to tolerate larger vibration amplitudes up to or beyond a quarter wavelength and to increase the data acquisition step size to that approaching the depth of field of standard microscope imaging systems.

© 2013 Optical Society of America

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