Kinetics of Thermally Activated Physical Processes in Disordered Media

Fibers

Bertrand Poumellec²  Matthieu Lancry¹ 

[1] Institut de Chimie Moléculaire et des Matériaux d’Orsay, Université Paris Sud, UMR CNRS-UPSud 8182, Orsay Center, 91405 Orsay, France; E-Mail

关键词: glasses;    photodarkening;    radiation-induced attenuation;    fiber Bragg gratings;    and lifetime prediction;   

DOI  :  10.3390/fib3030206

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.