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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 21 — Jul. 20, 2006
  • pp: 5358–5367

Localized CO2 laser damage repair of fused silica optics

E. Mendez, K. M. Nowak, H. J. Baker, F. J. Villarreal, and D. R. Hall  »View Author Affiliations


Applied Optics, Vol. 45, Issue 21, pp. 5358-5367 (2006)
http://dx.doi.org/10.1364/AO.45.005358


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Abstract

A technique has been developed for the localized treatment of laser damage sites in fused silica optics by CO 2 laser melt-flow smoothing, by using a 50 to 125   μm diameter beam in a regime that avoids mass removal by ablation. A detailed calibration of the laser irradiance for the threshold ablation of craters was carried out for a range of beam diameters and pulses in the 20   μs to 200   ms range. The results agree with a thermal model that also provides estimates of the melt depth for the different irradiation conditions. Smoothing trials for glass melting at irradiance values just below the ablation threshold irradiance were conducted to determine the optimum conditions and limits for the smoothing process. The technique has been found to remove damage pits up to a depth of 0 .5   μm , while the small melt depth associated with localized treatment limits the smoothing to a 5   μm lateral size.

© 2006 Optical Society of America

OCIS Codes
(140.3470) Lasers and laser optics : Lasers, carbon dioxide
(160.6030) Materials : Silica
(240.5450) Optics at surfaces : Polishing

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: November 15, 2005
Revised Manuscript: February 6, 2006
Manuscript Accepted: February 12, 2006

Citation
E. Mendez, K. M. Nowak, H. J. Baker, F. J. Villarreal, and D. R. Hall, "Localized CO2 laser damage repair of fused silica optics," Appl. Opt. 45, 5358-5367 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-21-5358

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