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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 22, Iss. 4 — Apr. 1, 2005
  • pp: 905–912

Durable solgel antireflective films with high laser-induced damage thresholds for inertial confinement fusion

Yao Xu, Lei Zhang, Dong Wu, Yu Han Sun, Zu Xing Huang, Xiao Dong Jiang, Xiao Feng Wei, Zhi Hong Li, Bao Zhong Dong, and Zhong Hua Wu  »View Author Affiliations

JOSA B, Vol. 22, Issue 4, pp. 905-912 (2005)

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We tested the use of two hydrophobic methyl-substituted silane precursors, methyltriethoxysilane and dimethyldiethoxysilane, to synthesize methyl-modified silica sols by a two-step method and a cohydrolysis method to produce durable antireflective films with high laser-induced-damage thresholds (LIDTs). Using small-angle x-ray scattering technology, we obtained details of the microstructure of clusters in sol and found various double fractal structural characteristics in the methyl-modified silica clusters; our findings were confirmed by transmission-electron micrographs. Through a  29Si magic-angle spin nuclear magnetic resonance study of the corresponding xerogels, we determined the double-fractal microstructure, which we then related to the LIDTs of AR films. The distribution configuration of methyls in clusters determined the double-fractal microstructure of clusters and then the LIDTs of AR films. The LIDTs of films produced by the cohydrolysis method (the highest was 38 J/cm2 for 1-ns, 1064-nm laser action) were much higher than those from the two-step method because of the loose netlike clusters in the former configuration. During the 220-day aging, the transmittance of hydrophobic AR film decreased ∼0.2%. So it is practicable to prepare durable AR films with higher LIDTs than those of normal AR SiO2 films only by introducing hydrophobic methyls into a Si–O–Si matrix of clusters if an appropriate hydrophobic precursor is chosen.

© 2005 Optical Society of America

OCIS Codes
(140.3330) Lasers and laser optics : Laser damage
(160.6030) Materials : Silica
(160.6060) Materials : Solgel
(240.6490) Optics at surfaces : Spectroscopy, surface
(310.1210) Thin films : Antireflection coatings
(310.1620) Thin films : Interference coatings

Yao Xu, Lei Zhang, Dong Wu, Yu Han Sun, Zu Xing Huang, Xiao Dong Jiang, Xiao Feng Wei, Zhi Hong Li, Bao Zhong Dong, and Zhong Hua Wu, "Durable solgel antireflective films with high laser-induced damage thresholds for inertial confinement fusion," J. Opt. Soc. Am. B 22, 905-912 (2005)

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