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Optical Engineering

Birefringence measurements by an electro-optic modulator using a new heterodyne scheme
Author(s): Yu-Lung Lo; Ping-Feng Hsu
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Paper Abstract

A new method for measuring changes in birefringence (or retardation) by modulating an electro-optic (EO) modulator in a sine-wave signal is developed in a common-path interferometer (polarimeter). The standard heterodyne signal, therefore, can be formed with a new heterodyne scheme, and subsequently the phase shift regarding to changes in birefringence is demodulated by a lock-in amplifier or phase meter. As compared to the conventional techniques, this technique supplies an easier setup, wider modulated frequency, and therefore, a wider frequency response in a sensing system. Finally, the birefringence measurement based on an EO modulator and a new heterodyne scheme in a common-path interferometer is first demonstrated.

Paper Details

Date Published: 1 November 2002
PDF: 4 pages
Opt. Eng. 41(11) doi: 10.1117/1.1512908
Published in: Optical Engineering Volume 41, Issue 11
Show Author Affiliations
Yu-Lung Lo, National Cheng Kung Univ. (Taiwan)
Ping-Feng Hsu, National Cheng Kung Univ. (Taiwan)


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