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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 28 — Oct. 1, 2012
  • pp: 6781–6788

Influence of composition and seed dimension on the structure and laser damage of nodular defects in HfO2/SiO2 high reflectors

Chaoyang Wei, Kui Yi, Zhengxiu Fan, and Jianda Shao  »View Author Affiliations

Applied Optics, Vol. 51, Issue 28, pp. 6781-6788 (2012)

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Seeds are the sources for forming nodular defects that largely limit the improvement of laser-induced damage threshold of 1ω laser mirrors in the nanosecond pulse regime. To shed more light of the composition and sizes of seeds on the associated structure of nodular defects and laser damage sensitivity, nodular defects were generated in 1064 nm HfO2/SiO2 high reflectors with different sizes of absorbing Au and nonabsorbing SiO2 nanoparticles located on the surfaces of substrates. The width dimensions, inner structures, and damage morphologies of nodular defects were characterized by an atomic force microscope, a field emission scanning electron microscope, and a focused ion beam. It was found that the composition and size both influenced the structure and the laser damage of nodular defects. The width of nodules from SiO2 seeds were larger than that formed by the same size of Au seed. A nodule grown from a small seed generally tends to have a continuous and stable boundary. The ejection fluences of nodules generated from different size absorbing Au and nonabsorbing SiO2 seeds were totally different. The results were interpreted from the aspects of absorption cross sections of seeds and mechanical stability of nodular structures.

© 2012 Optical Society of America

OCIS Codes
(140.3330) Lasers and laser optics : Laser damage
(230.4170) Optical devices : Multilayers

ToC Category:
Lasers and Laser Optics

Original Manuscript: April 19, 2012
Revised Manuscript: July 18, 2012
Manuscript Accepted: August 28, 2012
Published: September 25, 2012

Chaoyang Wei, Kui Yi, Zhengxiu Fan, and Jianda Shao, "Influence of composition and seed dimension on the structure and laser damage of nodular defects in HfO2/SiO2 high reflectors," Appl. Opt. 51, 6781-6788 (2012)

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