Method for determining full-field absolute phases in the common-path heterodyne interferometer with an electro-optic modulator
Applied Optics, Vol. 47, Issue 35, pp. 6518-6523 (2008)
http://dx.doi.org/10.1364/AO.47.006518
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Abstract
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
History
Original Manuscript: July 11, 2008
Revised Manuscript: October 31, 2008
Manuscript Accepted: November 4, 2008
Published: December 3, 2008
Citation
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)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-35-6518
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