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Advances in Condensed Matter Physics
Volume 2014 (2014), Article ID 769059, 4 pages
http://dx.doi.org/10.1155/2014/769059
Research Article

Evolution of Oxygen Deficiency Center on Fused Silica Surface Irradiated by Ultraviolet Laser and Posttreatment

1Research Center of Laser Fusion, China Academy of Engineering Physics (CAEP), P.O. Box 919-988-5, Mianyang 621900, China
2Thin Film Centre, Scottish Universities Physics Alliance (SUPA), University of the West of Scotland, Paisley PA1 2BE, UK
3School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China

Received 7 February 2014; Accepted 11 May 2014; Published 29 May 2014

Academic Editor: Haiyan Xiao

Copyright © 2014 Hai-Bing Lü et al. 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.

Abstract

Evolution of oxygen deficiency centers (ODCs) on a fused silica surface irradiated using a 355 nm ultraviolet (UV) laser beam in both vacuum and atmospheric conditions was quantitatively studied using photoluminescence and X-ray photoelectron spectroscopy. When the fusedsilica surface was exposed to the UV laser in vacuum, the laser damage threshold was decreased whereas the concentration of the ODCs was increased. For the fuse silica operated under the high power lasers, creation of ODCs on their surface resulted from the UV laser irradiation, and this is more severe in a high vacuum. The laser fluence and/or laser intensity have significant effects on the increase of the ODCs concentration. The ODCs can be effectively repaired using postoxygen plasma treatment and UV laser irradiation in an excessive oxygen environment. Results also demonstrated that the “gain” and “loss” of oxygen at the silica surface is a reversible and dynamic process.