• Effect of minute’s-scale aging on refractive index of chopped and non-chopped optical films

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      https://www.ias.ac.in/article/fulltext/pram/021/05/0311-0322

    • Keywords

       

      Non-chopped optical films; chopped optical films; refractive index; aging

    • Abstract

       

      The refractive indices of non-chopped and chopped films of cryolite, MgF2 and mixed cryolite-MgF2, which is higher than the bulk value, measured using spectro-photometer, ellipsometer and Abeles method are observed to be higher than corres-ponding bulk values. Chopped films show a higher refractive index than non-chopped films. The electron diffraction study shows a more amorphous structure for the chopped films. The major part played by chop-time seems to be in increasing the initial minute’s-scale aging rather than settling of ad-atoms during chop-time. The observed dispersion curve shows that some unknown material other than water gives an important aging effect.

    • Author Affiliations

       

      R K Puri1 K Vijaya1 R N Karekar1

      1. Department of Physics, University of Poona, Poona - 411 007, India
    • Dates

       
  • Pramana – Journal of Physics | News

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