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Interferometric measurement of refractive-index change in photosensitive glass



Tasshi Dennis, E. M. Gill, Sarah L. Gilbert


We report on a technique for determining the change in the refractive index of photosensitive glass. We have demonstrated our interferometer-based technique on fiber preform and bulk glass samples, achieving an optical: path-difference (OPD) repeatability of 0.2 nm. For the bulk glass sample we measured an OPD of 15.2 ± 3.0 nm, corresponding to an index change of 2.1 ± 0.7 x 10-5 Our technique was found to he insensitive to the effects of photodarkening and material compaction.
Optics Letters


Dennis, T. , Gill, E. and Gilbert, S. (2001), Interferometric measurement of refractive-index change in photosensitive glass, Optics Letters, [online], (Accessed April 21, 2024)
Created April 1, 2001, Updated February 19, 2017