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High damage threshold Al sub 2 O sub 3 ter dot H sub 2 O-SiO sub 2 HR (highly reflective) coatings prepared by the sol-gel process

Conference ·
OSTI ID:7186269
Our study of highly reflective (HR) dielectric coatings prepared by the sol-gel process has indicated that hydrated alumina and silica are the materials of choice for the high and low index components respectively. We can now prepare 32--36 quarter-wave-layer samples from colloidal suspensions of the relevant oxides by spin coating at room temperature. These have reflectivities of about 99% and damage thresholds in the range 30--40 J/cm{sup 2} at 1064 nm with 16 ns pulses at 30 Hz. This threefold improvement in threshold over that reported earlier for this system was attributed to an improvement in the preparative technique particularly in regard to cleanliness. Coatings have been prepared recently on substrates up to 8'' in diameter and scale-up development continues. 4 refs., 4 figs., 1 tab.
Research Organization:
Lawrence Livermore National Lab., CA (USA)
Sponsoring Organization:
DOE/DP
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
7186269
Report Number(s):
UCRL-101640; CONF-8911192--2; ON: DE90012079
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COATINGS
DISPERSIONS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
REFLECTIVE COATINGS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SOL-GEL PROCESS
SUSPENSIONS