• Step index fibre using laser interferometer

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      https://www.ias.ac.in/article/fulltext/pram/082/03/0529-0536

    • Keywords

       

      Multiple beam interference; laser radiation; tomographic images; step index and graded index fibres.

    • Abstract

       

      model is suggested to describe the fringe shift which occurs due to the phase variations of cladded glass fibre introduced between the two plates of the liquid wedge interferometer illuminated with a He–Ne laser. The fringe shift of the phase object which appears in the denominator of the Airy distribution formula of the multiple beam interference is represented in the harmonic term. An experiment is conducted using liquid wedge interferometer where the step index glass fibre of a nearly quadratic thickness variation is introduced between the two plates of the interferometer. The obtained fringe shift shows a good agreement with the proposed quadratic model. The Matlab code is written to plot the interferometer fringes comprising the shift of the step index fibre. Secondly, recognition of elliptical fibres is outlined using tomographic imaging. Finally, results and concluding remarks are given.

    • Author Affiliations

       

      A M Hamed1

      1. Physics Department, Faculty of Science, Ain Shams University, Cairo 11566, Egypt
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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