Interferometric determination of gamma radiation effects on optical parameters of a GRIN optical fibre

M. Medhat*, S. Y. El-Zaiat, Saleh M. Abdou, Amr Radi, M. F. Omar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Multiple-beam white-light interference fringes across an irradiated GRIN fibre, of length 2 cm and immersed in a liquid wedge interferometer that is followed by a grating spectrograph, are produced. These fringes are used to investigate the effect of gamma radiation, with different doses from 0.01 to 1 MGy, on the optical parameters of both the cladding (pure silica) and the core (germanium-doped silica) of the GRIN fibre. Optical parameters such as refractive index, refractive index difference, numerical aperture, V-number, index profile, chromatic dispersion and zero-dispersion wavelength are determined and studied. A two-term Sellmeier dispersion relation is adopted and fitted to the experimental data of the refractive index. Then, a dose-dependent Sellmeier formula is deduced to represent the effect of gamma radiation on different optical parameters.

Original languageEnglish
Article number320
Pages (from-to)485-490
Number of pages6
JournalJournal of Optics A: Pure and Applied Optics
Issue number4
Publication statusPublished - Jul 2002
Externally publishedYes


  • Dispersion
  • GRIN fibre
  • Gamma radiation
  • Interferometric
  • Optical parameters
  • Refractive index

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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