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

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.

R K Puri¹ K Vijaya¹ R N Karekar¹

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

Published

November 1983

Manuscript received

20 July 1983

Manuscript revised

28 September 1983