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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 6 — Mar. 15, 2014
  • pp: 1545–1548

Influence of nodular defects on the laser damage resistance of optical coatings in the femtosecond regime

Laurent Gallais, Xinbin Cheng, and Zhanshan Wang  »View Author Affiliations


Optics Letters, Vol. 39, Issue 6, pp. 1545-1548 (2014)
http://dx.doi.org/10.1364/OL.39.001545


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Abstract

The influence of nodular coating defects on the sub-picosecond laser damage resistance of multilayer coatings is investigated. The study is conducted on engineered nodules from monodisperse silica microspheres in HfO2/SiO2 high-reflective mirrors, at 400fs/1030nm. We demonstrate through an experimental study coupled with 3D finite-difference time-domain simulations that nodules in dielectric multilayer coatings are a main concern for the damage resistance of femtosecond optics. The nodules, and hence possibly other defects that produce E-field enhancement in coating materials, induce damage initiation at very low fluences (0.1J/cm2 in the case under study) compared to the intrinsic damage threshold of the component (1.4J/cm2 for the present mirror). After initiation, the damage sites grow catastrophically at a determined threshold, reducing significantly the damage resistance (0.6J/cm2) but allowing a “safe” operating fluence to be defined.

© 2014 Optical Society of America

OCIS Codes
(140.3330) Lasers and laser optics : Laser damage
(140.7090) Lasers and laser optics : Ultrafast lasers
(310.0310) Thin films : Thin films

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: January 9, 2014
Manuscript Accepted: January 25, 2014
Published: March 12, 2014

Citation
Laurent Gallais, Xinbin Cheng, and Zhanshan Wang, "Influence of nodular defects on the laser damage resistance of optical coatings in the femtosecond regime," Opt. Lett. 39, 1545-1548 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-6-1545


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