An improved method for measuring refractive-index of a medium

Der Chin Su, Ju Yi Lee

Research output: Contribution to journalConference articlepeer-review


An improved method for measuring the refractive index of a medium is presented. First, the light coming form a circular heterodyne source is incident on the test medium. And, the reflected light passes through an analyzer with the transmission axis at a moderate azimuth angle. Then, the phase variation of the reflected light is measured by the heterodyne interferometric technique. Finally, substituting this phase variation into the equations derived from Fresnel's equations and Jones calculus, we can obtain the refractive index of the test medium.

Original languageEnglish
Pages (from-to)245-252
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1998
EventLaser Interferometry IX: Techniques and Analysis - San Diego, CA, United States
Duration: 20 Jul 199820 Jul 1998


  • Fresnel's equation
  • Heterodyne interferometry
  • Index measurements


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