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Multiwavelength digital holography with autocalibration of phase shifts and artificial wavelengths

: Carl, D.; Fratz, M.; Pfeifer, M.; Giel, D.M.; Höfler, H.

Preprint urn:nbn:de:0011-n-1102162 (1.3 MByte PDF)
MD5 Fingerprint: e62bdf6a440b5176eed5f5949437d164
Created on: 13.11.2009

Applied optics 48 (2009), No.34, pp.H1-H8
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Journal Article, Electronic Publication
Fraunhofer IPM ()
holography; digital holography; multiplex holography; speckle interferometry; metrology; phase measurement

A novel implementation of lensless multiwavelength digital holography with autocalibration of temporal phase shifts and artificial wavelength is presented. The algorithm we used to calculate the phase shifts was previously proposed [Opt. Lett.29 183 (2004)OPLEDP0146-959210.1364/OL.29.000183] and, to our knowledge, is now used for the first time in lensless holography. Because precise knowledge of the generated artificial wavelength is crucial for absolute measurement accuracy, a simple and efficient method to determine the artificial wavelength directly is presented. The calibration method is based on a simple modification of the experimental setup and needs just one additional image acquisition per wavelength. The results of shape measurement of a metallic test object with a rough surface and steep edges are shown and the measurement accuracy is discussed.