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Holographic profilometry with a rhodium-doped barium titanate crystal and a diode laser

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Abstract

We present a novel, whole-field, noncontact profilometer based on real-time, two-color contour holography. A single 30-mW laser diode was used to record a hologram in a BaTiO3:Rh crystal, and the reconstructed image was interfered with the real-time object wave. Current modulation of the diode laser produced continuously tunable contour intervals. The resulting interferograms were processed by use of phase-shift interferometry algorithms to yield quantitative, three-dimensional measurements of the original object. We demonstrate submillimeter depth resolution and show how resolution and speed can be further improved.

© 1997 Optical Society of America

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