Measurements of phase retardation and principal axis angle using an electro-optic modulated Mach-Zehnder interferometer

被引：18
|
作者：
Lee, SY
Lin, JF
Lo, YL
机构：
[1] Natl Cheng Kung Univ, Dept Mech Engn, Tainan 701, Taiwan
[2] Far East Coll, Dept Comp Applicat Engn, Tainan 744, Taiwan
来源：
OPTICS AND LASERS IN ENGINEERING | 2005年 / 43卷 / 06期
关键词：
retardation; birefringence; polarization; EO modulator; Mach Zehnder heterodyne interferometer;
D O I：
10.1016/j.optlaseng.2004.09.011
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
This paper presents an electro-optic modulated circular heterodyne modified Mach Zehnder interferometer and a convenient two-phase signal-processing algorithm for the measurement of variations in the magnitude of phase retardation and the angle of principal axis in optical materials. The developed method solves the problems of normalized intensity jump and limited phase retardation measurement range associated with the circular heterodyne interferometer proposed previously. The present method uses a saw-tooth wave signal to drive an electro-optic (EO) modulator, and employs a lock-in amplifier to demodulate the principal axis angle and the phase retardation. Specifically, this paper considers two main sources of measurement errors, namely the misorientation of the EO modulator and the reflection phase retardation of the beam splitter. Furthermore, the study develops calibration procedures and identifies a means to minimize measurement errors induced by the reflection phase retardation of the beam splitter. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：704 / 720
页数：17
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