Nanoindentation study on germania-doped silica glass preforms: evidence for the compaction-densification model of photosensitivity

Aashia, R and Madhav, KV and Ramamurty, U and Asokan, S (2009) Nanoindentation study on germania-doped silica glass preforms: evidence for the compaction-densification model of photosensitivity. In: Optics Letters, 34 (16). pp. 2414-2416.

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Abstract

Nanoindentation technique was employed to measure the changes in mechanical properties of a glass preform subjected to different levels of UV exposure. The results reveal that short-term exposure leads to an appreciable increase in the Young's modulus (E), suggesting the densification of the glass, confirming the compaction-densification model. However, on prolonged exposure, E decreases, which provides what we believe to be the first direct evidence of dilation in the glass leading into the Type IIA regime. The present results rule out the hypothesis that continued exposure leads to an irreversible compaction and prove that index modulation regimes are intrinsic to the glass matrix.

Item Type:	Journal Article
Publication:	Optics Letters
Publisher:	Optical Society of America
Additional Information:	Copyright of this article belongs to Optical Society of America.
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	16 Dec 2009 09:51
Last Modified:	22 Feb 2012 06:26
URI:	http://eprints.iisc.ac.in/id/eprint/23820

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