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

S. Y. Lee, J. F. Lin, Y. L. Lo

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)704-720
Number of pages17
JournalOptics and Lasers in Engineering
Volume43
Issue number6
DOIs
Publication statusPublished - 2005 Jun 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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