Abstract

Accurate measurement of large step heights using multiple-wavelength holographic interferometry is realized using laser diodes. Due to the high-resolution wavelength tunability of such lasers, a pair of holograms with a wavelength difference of less than 0.01nm is recorded and used to extract a phase difference having a large synthetic wavelength. Phase differences with synthetic wavelengths ranging from 2.5to73mm are extracted by using pairs of holograms with wavelength differences between 0.3 and 0.01nm. By combining the phase differences, measurements with a step height of 18mm and an rms error of 0.04mm could be achieved. The requirements for performing the phase unwrapping are discussed. Precise knowledge of the recording wavelengths is required to correctly perform this unwrapping.

© 2008 Optical Society of America

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