Wavelength measurement by Fourier analysis of interference fringes through a plane parallel plate

Choonghwan Lee, Heejoo Choi, Jiung Kim, Myoungsik Cha, Jonghan Jin

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

When a diverging laser beam passed through a plane parallel glass plate, interference fringes were observed; analysis of these fringes provided accurate estimation of the source wavelength. The fringes had a unique angular range of uniform fringe density. Fourier transform of the fringes in this range directly provided wavelength information. Reference lasers were used to establish a calibration between the fringe density and wavenumber, with which we estimated the wavelength of a test laser. An accuracy of 4.5 × 10−5 was obtained, which is better than that of conventional grating spectrometers, while providing a much broader free spectral range. Our method has unique features, such as extreme simplicity of the setup, fast analysis, and low cost, which are great advantages in practical wavelength meter applications.

Original languageEnglish (US)
Pages (from-to)9638-9643
Number of pages6
JournalApplied optics
Volume56
Issue number35
DOIs
StatePublished - Dec 10 2017

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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