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Sol-Gel Multilayers Applied by A Meniscus Coating Process

Published online by Cambridge University Press:  25 February 2011

Jerald A. Britten
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
Ian M. Thomas
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
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Abstract

We describe a meniscus coating method to produce high-laser damage threshold, silica/alumina sol-gel multilayer reflectors on 30+ cm substrates for laser-fusion applications. This process involves forcing a small suspension flow through a porous applicator tube, forming a falling film on the tube. A substrate contacts this film to form a meniscus. Motion of the substrate relative to the applicator entrains a thin film on the substrate, which leaves behind a porous, optical quality film upon solvent evaporation. We develop a solution for the entrained film thickness as a function of geometry, flow and fluid properties by an analysis similar to that of the classical dip-coating problem. This solution is compared with experimental measurements. Also, preliminary results of multilayer coating experiments with a prototype coater are presented, which focus on coating uniformity and laser damage threshold (LDT).

Type
Research Article
Copyright
Copyright © Materials Research Society 1992

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References

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8. Morgan, A. J., Rainer, F., DeMarco, R. P., Kozlowski, M. R. and Staggs, M. C, in Laser Induced Damage in Optical Materials: 1989 Proc. Boulder Damage Sympo-sium Nov 1–3, 1989, SPIE vol 1438 47 (1990)CrossRefGoogle Scholar
9. Wolfe, C. R., Kozlowski, M. R., Campbell, J. H., Rainer, F., Morgan, A. H., and Gonzalez, R. P., in Laser Induced Damage in Optical Materials: 1989 Proc. Boulder Damage Symposium Nov 1–3, 1989, SPIE vol 1438 360 (1990)CrossRefGoogle Scholar

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