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Advances in Condensed Matter Physics
Volume 2014, Article ID 676108, 5 pages
http://dx.doi.org/10.1155/2014/676108
Research Article

Full Aperture CO2 Laser Process to Improve Laser Damage Resistance of Fused Silica Optical Surface

Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China

Received 28 February 2014; Accepted 26 May 2014; Published 17 July 2014

Academic Editor: Xiao-Tao Zu

Copyright © 2014 Wei Liao 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

An improved method is presented to scan the full-aperture optical surface rapidly by using galvanometer steering mirrors. In contrast to the previous studies, the scanning velocity is faster by several orders of magnitude. The velocity is chosen to allow little thermodeposition thus providing small and uniform residual stress. An appropriate power density is set to obtain a lower processing temperature. The proper parameters can help to prevent optical surface from fracturing during operation at high laser flux. S-on-1 damage test results show that the damage threshold of scanned area is approximately 40% higher than that of untreated area.