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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 9 — Mar. 21, 2005
  • pp: 1577–1581

Two-wavelength phase-shifting interferometry with a superimposed grating displayed on an electrically addressed spatial light modulator

Youichi Bitou  »View Author Affiliations


Applied Optics, Vol. 44, Issue 9, pp. 1577-1581 (2005)
http://dx.doi.org/10.1364/AO.44.001577


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Abstract

A two-wavelength moire phase-shifting interferometer that uses a superimposed grating has been developed. The optical phase shifts for the two wavelengths are given by digital phase shifts of a superimposed grating displayed on a liquid-crystal spatial light modulator. A phase shift of the moire fringe is achieved by equal phase shifts with opposite signs in the two gratings. A moire phase-shifting interferometer with no moving parts and no requirement for calibration of the value of the phase shifts was obtained. Our experimental result shows measurements of the profile of a step object with a 2.65-µm synthetic wavelength.

© 2005 Optical Society of America

OCIS Codes
(050.5080) Diffraction and gratings : Phase shift
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.4120) Instrumentation, measurement, and metrology : Moire' techniques
(230.6120) Optical devices : Spatial light modulators

Citation
Youichi Bitou, "Two-wavelength phase-shifting interferometry with a superimposed grating displayed on an electrically addressed spatial light modulator," Appl. Opt. 44, 1577-1581 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-9-1577


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References

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