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Proceedings Paper

Tunable laser-diode digital holographic interferometry without measuring wavelength differences
Author(s): Yukihiro Ishii; Kazuki Yoshida
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Paper Abstract

Multiple-wavelength holographic interferometry is an effective technique to generate a contour map of a diffusely reflecting object surface in the speckle field. A synthetic wavelength can be well generated by changing the current of laser diodes. A small synthetic wavelength needs a wide tunable external-cavity laser diode. A step object profile with discontinuous structure can be measured by using a synthetic wavelength to be sufficiently large that is derived from a known step height measured by vernier calipers but not wavelength measurements. The tunable laser-diode holographic interferometry is verified by experimental results.

Paper Details

Date Published: 13 September 2010
PDF: 9 pages
Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73870P (13 September 2010); doi: 10.1117/12.871591
Show Author Affiliations
Yukihiro Ishii, Tokyo Univ. of Science (Japan)
Kazuki Yoshida, Tokyo Univ. of Science (Japan)

Published in SPIE Proceedings Vol. 7387:
Speckle 2010: Optical Metrology
Armando Albertazzi Goncalves Jr.; Guillermo H. Kaufmann, Editor(s)

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