Fringe Visibility of Light with Fine Spectral Structure

Document Type : Original Article

Authors

Department of Physics, Faculty of Science, Helwan University, Cairo, Egypt

Abstract

Analytical expression is derived for the visibility of two beams interference fringes of light with spectral fine structure. Lorentz and Gaussian spectral light are taken into consideration.

Michelson interferometer is used for studying experimentally the fringe visibility of sodium doublet spectral lines and He-Ne laser beam of multispectral axial modes as spectral fine structure. The results show that periodicity of appearing and disappearing of the interference fringes associated with decaying in their visibility along equal intervals of changes in the optical path difference between the interfering beams. This behavior of the damping characteristic enables us to know the type of the spectral line distribution whether it is Lorentz, Gauss or of Voigt profile. The experimental measurements show good agreement with the theoretical derived formula. The study gave information about the spectral spacing between the fine spectral lines forming the spectral distribution of the light beam, spectral distribution and spectral width.

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History

  • Receive Date: 20 July 2023
  • Revise Date: 10 November 2023
  • Accept Date: 10 November 2023

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