Single layer Al sub 2 O sub 3 ter dot H sub 2 O and multilayer Al sub 2 O sub 3 ter dot H sub 2 O--SiO sub 2 optical coatings prepared from colloidal suspensions

Journal Article · Fri Sep 15 04:00:00 EDT 1989 · Applied Optics; (USA)

DOI:https://doi.org/10.1364/AO.28.004013· OSTI ID:5650009

Thomas, I M ^[1]

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1. Lawrence Livermore National Laboratory, P.O. Box 5508, Livermore, California 94550 (US)

Single layer coatings of Al{sub 2}O{sub 3}{center dot}H{sub 2}O 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 {similar to}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/cm{sup 2}, respectively.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5650009
• Journal Information: Applied Optics; (USA), Journal Name: Applied Optics; (USA) Vol. 28:18; ISSN 0003-6935; ISSN APOPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
42 ENGINEERING
420300 -- Engineering-- Lasers-- (-1989)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ANTIREFLECTION COATINGS
CHALCOGENIDES
COATINGS
COLLOIDS
DAMAGE
DISPERSIONS
ELECTROMAGNETIC RADIATION
LASER RADIATION
MINERALS
NOVA FACILITY
OPTICAL PROPERTIES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
REFLECTIVITY
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SURFACE PROPERTIES
SUSPENSIONS