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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 9 — Mar. 20, 2011
  • pp: C178–C187

Laser-induced damage of hafnia coatings as a function of pulse duration in the femtosecond to nanosecond range

Laurent Gallais, Benoît Mangote, Myriam Zerrad, Mireille Commandré, Andrius Melninkaitis, Julius Mirauskas, Maksim Jeskevic, and Valdas Sirutkaitis  »View Author Affiliations


Applied Optics, Vol. 50, Issue 9, pp. C178-C187 (2011)
http://dx.doi.org/10.1364/AO.50.00C178


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Abstract

Laser-damage thresholds and morphologies of hafnia single layers exposed under femtosecond, picosecond, and nanosecond single pulses ( 1030 / 1064 nm ) are reported. The samples were made with different deposition parameters in order to study how the damage behavior of the samples evolves with the pulse duration and how it is linked to the deposition process. In the femtosecond to picosecond regime, the scaling law of the laser-induced damage threshold as a function of pulse duration is in good agreement with the models of photo and avalanche ionization based on the rate equation for free electron generation. However, differences in the damage morphologies between samples are shown. No correlation between the nanosecond and femtosecond/picosecond laser-damage resistance of hafnia coatings could be established. We also report evidence of the transition in damage mechanisms for hafnia, from an ablation process linked to intrinsic properties of the material to a defect-induced process, that exists between a few picoseconds and a few tens of picoseconds.

© 2011 Optical Society of America

OCIS Codes
(140.3330) Lasers and laser optics : Laser damage
(140.7090) Lasers and laser optics : Ultrafast lasers
(310.1620) Thin films : Interference coatings
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors

History
Original Manuscript: July 30, 2010
Revised Manuscript: October 21, 2010
Manuscript Accepted: October 29, 2010
Published: December 6, 2010

Citation
Laurent Gallais, Benoît Mangote, Myriam Zerrad, Mireille Commandré, Andrius Melninkaitis, Julius Mirauskas, Maksim Jeskevic, and Valdas Sirutkaitis, "Laser-induced damage of hafnia coatings as a function of pulse duration in the femtosecond to nanosecond range," Appl. Opt. 50, C178-C187 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-9-C178

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