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Fibers 2015, 3(3), 206-252; doi:10.3390/fib3030206

Kinetics of Thermally Activated Physical Processes in Disordered Media

Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris Sud, UMR CNRS-UPSud 8182, Orsay Center, 91405 Orsay, France
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Author to whom correspondence should be addressed.
Academic Editor: Stephen C. Bondy
Received: 7 January 2015 / Accepted: 1 April 2015 / Published: 15 July 2015

Abstract

We describe a framework for modeling the writing and erasure of thermally-distributed activated processes that we can specifically apply to UV-induced refractive index change, particularly in fibers. From experimental measurements (isochrons and/or isotherms), this framework allows to find the distribution function of the activation energy by providing only a constant, which can be determined by a simple variable change when a few assumptions are fulfilled. From this modeling, it is possible to know the complete evolution in time of the system. It is also possible to determine the annealing conditions for extending a lifetime. This approach can also be used for other physical quantities, such as photodarkening, stress relaxation, and luminescence decay, provided that it can be described by a distribution function. View Full-Text
Keywords: glasses; photodarkening; radiation-induced attenuation; fiber Bragg gratings; and lifetime prediction glasses; photodarkening; radiation-induced attenuation; fiber Bragg gratings; and lifetime prediction
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Poumellec, B.; Lancry, M. Kinetics of Thermally Activated Physical Processes in Disordered Media. Fibers 2015, 3, 206-252.

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