Authors

J. Lumeau;L. B. Glebov

Comments

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Abbreviated Journal Title

Opt. Mater. Express

Keywords

PHOTOTHERMOREFRACTIVE GLASS; PHOTOSENSITIVE GLASS; BRAGG GRATINGS; NUCLEATION; Materials Science, Multidisciplinary; Optics

Abstract

Photo-thermo-refractive (PTR) glass is a photosensitive multi-component silicate glass that exhibits refractive index change after successive UV-exposure and thermal treatment. The refractive index change was demonstrated to be associated with the precipitation of NaF nano-crystals in the glass matrix. This paper presents a systematic study of the dependence of the refractive index change on dosage of UV-exposure and thermal treatment duration and temperature in already UV-exposed and nucleated samples. It is shown using Avrami plots that the refractive index change in PTR glass is determined by a diffusion-controlled growth of particles from pre-existing nuclei while all coefficients have exponential dependence on temperature (Boltzmann law). The developed model, which includes both photo-chemistry and crystallization processes, allow describing the refractive index change dependence on dosage for a wide range of thermal treatment duration and temperature and an accuracy better than 10%.

Journal Title

Optical Materials Express

Volume

3

Issue/Number

1

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

95

Last Page

104

WOS Identifier

WOS:000312704100010

ISSN

2159-3930

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