Birefringence measurements by an electro-optic modulator using a new heterodyne scheme

Yu Lung Lo, Ping Feng Hsu

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


A new method for measuring changes in birefringence (or retardation) by modulating an electro-optic (EO) modulator in a sinewave 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.

Original languageEnglish
Pages (from-to)2764-2767
Number of pages4
JournalOptical Engineering
Issue number11
Publication statusPublished - 2002 Nov

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)


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