Abstract
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 ×
10-5. Our technique was found to be insensitive to the
effects of photodarkening and material compaction.
© 2001 Optical Society of America
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