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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 25 — Sep. 1, 2012
  • pp: 6188–6195

Femtosecond laser-induced damage of HfO2/SiO2 mirror with different stack structure

Shunli Chen, Yuan’an Zhao, Zhenkun Yu, Zhou Fang, Dawei Li, Hongbo He, and Jianda Shao  »View Author Affiliations


Applied Optics, Vol. 51, Issue 25, pp. 6188-6195 (2012)
http://dx.doi.org/10.1364/AO.51.006188


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Abstract

Laser-induced damage of the “standard” (λ/4 stack structure) and “modified” (reduced standing-wave field) HfO2/SiO2 mirrors were investigated by a commercial 800 nm Ti:sapphire laser system. Three kinds of pulse duration of 50 fs, 105 fs, and 135 fs were chosen. The results show that the single-shot damage threshold of the “modified” mirror was about 14%–23% higher compared to that of the “standard” mirror. A model based on the rate equation for free electron generation was adopted to explain the threshold results. It took in account the transient changes in the dielectric function of material during the laser pulse. The simulated threshold agreed with the experimental very well. Besides, for two kinds of mirror, typical breakdown craters for both the single-shots and multi-shots damage tests reveal striking distinct characteristics. Interestingly, the multi-shots damage crater with zigzag-like edge was observed only on the “standard” mirror. These phenomena were illustrated reasonably by the distribution features of the electric field intensity within the mirrors.

© 2012 Optical Society of America

OCIS Codes
(140.3330) Lasers and laser optics : Laser damage
(230.4170) Optical devices : Multilayers
(260.3230) Physical optics : Ionization
(310.1620) Thin films : Interference coatings
(320.2250) Ultrafast optics : Femtosecond phenomena

ToC Category:
Ultrafast Optics

History
Original Manuscript: June 18, 2012
Revised Manuscript: August 6, 2012
Manuscript Accepted: August 10, 2012
Published: August 29, 2012

Citation
Shunli Chen, Yuan’an Zhao, Zhenkun Yu, Zhou Fang, Dawei Li, Hongbo He, and Jianda Shao, "Femtosecond laser-induced damage of HfO2/SiO2 mirror with different stack structure," Appl. Opt. 51, 6188-6195 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-25-6188


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