Multiwavelength digital holography with autocalibration of phase shifts and artificial wavelengths
Applied Optics, Vol. 48, Issue 34, pp. H1-H8 (2009)
http://dx.doi.org/10.1364/AO.48.0000H1
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Abstract
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)] 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.
© 2009 Optical Society of America
OCIS Codes
(090.0090) Holography : Holography
(090.4220) Holography : Multiplex holography
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(090.1995) Holography : Digital holography
(120.6165) Instrumentation, measurement, and metrology : Speckle interferometry, metrology
History
Original Manuscript: June 30, 2009
Revised Manuscript: July 27, 2009
Manuscript Accepted: July 28, 2009
Published: August 10, 2009
Citation
Daniel Carl, Markus Fratz, Marcel Pfeifer, Dominik M. Giel, and Heinrich Höfler, "Multiwavelength digital holography with autocalibration of phase shifts and artificial wavelengths," Appl. Opt. 48, H1-H8 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-34-H1
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