Central fringe identification by phase quadrature interferometric technique and tunable laser-diode

Ju Yi Lee, Der Chin Su

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

When the optical path difference is not zero, the phase of the interferogram is strongly influenced by the wavelength variation of the light source. Under this condition, the phase variation can be estimated with a phase quadrature interferometric technique. And the central fringe of the interferogram can be identified as the phase variation remains unchanged. Based on this fact, an improved method to identify the central fringe is presented. It has some merits, such as simple optical setup, easier operation in real time, inexpensive, ability to judge which arm of interferometer is longer, etc. The feasibility is demonstrated with 10 nm resolution.

Original languageEnglish
Pages (from-to)333-337
Number of pages5
JournalOptics Communications
Volume198
Issue number4-6
DOIs
StatePublished - 1 Nov 2001

Keywords

  • Central fringe
  • Quadrature interferometry
  • White-light interferometry

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