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Applied Optics

Applied Optics


  • Vol. 28, Iss. 18 — Sep. 15, 1989
  • pp: 4013–4016

Single layer Al2O3·H2O and multilayer Al2O3·H2O–SiO2 optical coatings prepared from colloidal suspensions

Ian M. Thomas  »View Author Affiliations

Applied Optics, Vol. 28, Issue 18, pp. 4013-4016 (1989)

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Single layer coatings of Al2O3·H2O have been prepared on fused silica and BK-7 substrates from aqueous colloidal suspensions of hydrated alumina at room temperature. These coatings were porous and had a refractive index of ∼1.44. Multilayer, high reflectivity, dielectric coatings were also prepared by laying down quarterwave-thick, alternating coats of this alumina with silica, also prepared from colloidal suspension, and having a refractive index of 1.22. To achieve 99% reflectivity, 30–35 layers were required. Single shot, laser damage threshold measurements at 1064 nm wavelength with a pulse length of 10 ns were carried out on both the single layer and multilayer system. The thresholds averaged 21 and 12 J/cm2, respectively.

© 1989 Optical Society of America

Original Manuscript: September 29, 1988
Published: September 15, 1989

Ian M. Thomas, "Single layer Al2O3·H2O and multilayer Al2O3·H2O–SiO2 optical coatings prepared from colloidal suspensions," Appl. Opt. 28, 4013-4016 (1989)

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