Simple method for the measurement of small wavelength differences by optical activity of cholesteric liquid crystal and heterodyne interferometer

Jing Heng Chen, Kun Huang Chenb, Jiun-You Lin, Hsiang Yung Hsieh, Wei Yao Chang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, the optical activity of cholesteric liquid crystal and common-path heterodyne interferometry are used in a simple measurement technique that was developed to measure small wavelength differences. A circularly polarized heterodyne light passes through a cholesteric liquid crystal cell and an analyzer. Consequently, an interference signal is generated. When the cholesteric liquid crystal cell is properly chosen at circular regime, it owns strongly optical activity. Accordingly, the phase difference between the s- and p-polarized components of the interference signal depends strongly on the wavelength. As the wavelength changed, a variation of the phase difference can be accurately detected by heterodyne interferometry. Substituting the variation of phase difference into specially derived equations, the wavelength variations can be estimated accurately. The feasibility of this method was demonstrated and this method provides the advantages of a simple structure, easy operations, rapid measurement, high stability, and high sensitivity.

Original languageEnglish
Title of host publicationOptical Measurement Systems for Industrial Inspection VI
Volume7389
DOIs
Publication statusPublished - 2009 Sep 14
EventOptical Measurement Systems for Industrial Inspection VI - Munich, Germany
Duration: 2009 Jun 152009 Jun 18

Other

OtherOptical Measurement Systems for Industrial Inspection VI
CountryGermany
CityMunich
Period09-06-1509-06-18

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Chen, J. H., Chenb, K. H., Lin, J-Y., Hsieh, H. Y., & Chang, W. Y. (2009). Simple method for the measurement of small wavelength differences by optical activity of cholesteric liquid crystal and heterodyne interferometer. In Optical Measurement Systems for Industrial Inspection VI (Vol. 7389). [73892E] https://doi.org/10.1117/12.826846