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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 34, Iss. 14 — Jul. 15, 2009
  • pp: 2162–2164

Infrared absorption signature on laser-damaged optical thin films

Sangho S. Kim, Nicholas T. Gabriel, Wing S. Chan, and Joseph J. Talghader  »View Author Affiliations


Optics Letters, Vol. 34, Issue 14, pp. 2162-2164 (2009)
http://dx.doi.org/10.1364/OL.34.002162


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Abstract

Optical coating degradation under laser irradiation can take several forms. Perhaps the most common that is not due to particulates is thermal breakdown, caused by heating of the coating to a catastrophic failure induced by local melting, delamination, evaporation, or some other change. We demonstrate that micromachined dielectric membranes show strong differences in their hydroxyl signatures as measured by Fourier-transform IR spectroscopy. The changes correspond to regions of high fluence ( 3200 J cm 2 ) from a Nd:YAG laser. It is found that the absorption peaks associated with OH decrease after laser treatment, indicating a reduction in the number of film hydroxyl groups.

© 2009 Optical Society of America

OCIS Codes
(140.3330) Lasers and laser optics : Laser damage
(140.3440) Lasers and laser optics : Laser-induced breakdown
(220.4000) Optical design and fabrication : Microstructure fabrication
(300.1030) Spectroscopy : Absorption
(310.6870) Thin films : Thin films, other properties

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: May 15, 2009
Manuscript Accepted: May 29, 2009
Published: July 9, 2009

Citation
Sangho S. Kim, Nicholas T. Gabriel, Wing S. Chan, and Joseph J. Talghader, "Infrared absorption signature on laser-damaged optical thin films," Opt. Lett. 34, 2162-2164 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-14-2162


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