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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 23, Iss. 21 — Nov. 1, 1984
  • pp: 3796–3805

Absolute onset of optical surface damage using distributed defect ensembles

J. O. Porteus and Steven C. Seitel  »View Author Affiliations


Applied Optics, Vol. 23, Issue 21, pp. 3796-3805 (1984)
http://dx.doi.org/10.1364/AO.23.003796


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Abstract

The scaling of laser damage thresholds with irradiated spot size is a well-known effect. When damage is defect dominated, the spot-size scaling can be attributed to the conventional definition of the threshold at the 50% level of damage probability. By redefining the threshold at the 0% level (absolute damage onset), one obtains a result that is spot-size independent. A method is presented here for obtaining the damage onset of optical surfaces subjected to pulsed laser radiation. The method involves weighted least-squares fitting of damage frequency data with a three-parameter distributed ensemble representing inherent defect damage characteristics. Spot-size effects in the data are simulated by a scaling transformation applied to the ensemble before fitting. Direct and inverse transformations are derived for Gaussian and top-hat spatial intensity profiles, and advantages of the latter for testing are pointed out. Three examples of applications to 2.7-μm multilayer coatings are presented, and the general inadequacy of the two-parameter degenerate ensemble is demonstrated. Extraction of defect densities, discrimination of different defect classes, and representation of uncertainty in the onset are discussed.

© 1984 Optical Society of America

History
Original Manuscript: March 28, 1984
Published: November 1, 1984

Citation
J. O. Porteus and Steven C. Seitel, "Absolute onset of optical surface damage using distributed defect ensembles," Appl. Opt. 23, 3796-3805 (1984)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-23-21-3796

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