Measurements of the complex transmission/reflection coefficient of a material using mixed-type common-path heterodyne interferometery

J. J. Chieh, S. Y. Yang, Herng Er Horng, Chin Yih Hong, H. C. Yang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The dielectric constant, magnetic permeability, and refractive index are the fundamental optical parameters of a material. To investigate these optical parameters, a mixed-type common-path heterodyne interferometer is developed in this paper. By using this interferometer to detect the amplitudes and phases of both the transmission and reflection coefficients, the complex dielectric constant, magnetic permeability, and refractive index can be obtained using the algorithm discussed here. The validity of the mixed-type common-path heterodyne interferometer is demonstrated for visible lights, such as red, green, and blue, using lasers as light sources. Furthermore, the specifications for characterizing the optical properties of samples using the mixed-type common-path heterodyne interferometer are investigated. For example, dielectric constant ε, magnetic permeability μ, and the refractive index n of 2.161 + i0.002 0.9997 - i0.0009, and 1.4699 - i3.4 × 10-7 with low uncertainties of 0.003 + i0.002, 0.0003 + i0.0009, and 0.0007 + i8 × 10-8, respectively, for a fused quartz measuring 632.8 nm are investigated. It also demonstrated that, in the case of the investigation in visible ranges, the measurement procedure is performed by only the common-path transmission type heterodyne interferometer.

Original languageEnglish
Pages (from-to)1878-1885
Number of pages8
JournalIEEE Transactions on Instrumentation and Measurement
Volume58
Issue number6
DOIs
Publication statusPublished - 2009 Jan 1

Keywords

  • Common path
  • Complex reflection coefficient
  • Complex transmission coefficient
  • Heterodyne interferometer
  • Optical characterization

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

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