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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 35 — Dec. 10, 2008
  • pp: 6518–6523

Method for determining full-field absolute phases in the common-path heterodyne interferometer with an electro-optic modulator

Yen-Liang Chen and Der-Chin Su  »View Author Affiliations

Applied Optics, Vol. 47, Issue 35, pp. 6518-6523 (2008)

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When a sawtooth voltage signal with the amplitude lower than its half-wave voltage is applied to drive an electro-optic modulator, the interference signals become a group of periodic sinusoidal segments. A new algorithm is proposed to modify these segments to an associated continuous sinusoidal wave, and then its initial phase can be determined. Subtracting the characteristic phase of the modulator from the initial phase, the absolute phase can be obtained. This technique is applied to all pixels, and full-field absolute phase measurements can be achieved. The validity of this method is demonstrated.

© 2008 Optical Society of America

OCIS Codes
(040.2840) Detectors : Heterodyne
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(230.2090) Optical devices : Electro-optical devices

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: July 11, 2008
Revised Manuscript: October 31, 2008
Manuscript Accepted: November 4, 2008
Published: December 3, 2008

Yen-Liang Chen and Der-Chin Su, "Method for determining full-field absolute phases in the common-path heterodyne interferometer with an electro-optic modulator," Appl. Opt. 47, 6518-6523 (2008)

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