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Optical frequency comb profilometry using a single-pixel camera composed of digital micromirror devices

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Abstract

We demonstrate an optical frequency comb profilometer with a single-pixel camera to measure the position and profile of an object’s surface that exceeds far beyond light wavelength without 2π phase ambiguity. The present configuration of the single-pixel camera can perform the profilometry with an axial resolution of 3.4 μm at 1 GHz operation corresponding to a wavelength of 30 cm. Therefore, the axial dynamic range was increased to 0.87×105. It was found from the experiments and computer simulations that the improvement was derived from higher modulation contrast of digital micromirror devices. The frame rate was also increased to 20 Hz.

© 2014 Optical Society of America

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