Method of forming transmissive, porous metal oxide optical layer

Details Method of forming transmissive, porous metal oxide optical layer Method of forming transmissive, porous metal oxide optical layer

1980-01-28

1981-06-02

Hoffman, James R.

Coating processes

Optical element produced

Transparent base

427 64, 427160, B05D 118, B05D 302

Patent

active

042712106

ABSTRACT:
A method of forming an optically clear, thin metal oxide, porous layer on a vitreous glass substrate, with this metal oxide layer having a low index of refraction. A clear colloidal solution is prepared using metal alkoxide and the substrate is dipped in this solution. The concentration of metal oxide equivalent in the solution, and the rate of withdrawal of the glass substrate from the solution are controlled to form the porous metal oxide layer on the substrate with the layer being about a quarter-wavelength optically thick. This low index of refraction metal oxide layer forms an effective antireflective layer on a vitreous substrate of higher index of refraction, and minimize reflection from the substratemetal oxide layer interface.

REFERENCES:
patent: 3941719 (1976-03-01), Yoldas
patent: 4132919 (1979-01-01), Maple
patent: 4161560 (1979-07-01), Kienel
Yoldas, "Hydrolysis of Aluminum Alkoxides and Bayerite Conversion" J. Appl. Chem. Biotechnol, 1973, 23, pp. 803-809.
Yoldas, "Preparation of Glasses and Ceramics from Metal-Organic Compounds" J. Mat. Sci. 12 (1977), pp. 1203-1208.
Yoldas, "Monolithic Glass Formation by Chemical Polymerization" J. Mat. Sci. 14 (1979) pp. 1843-1849.
Yoldas, "A Transparent Porous Alumina" Ceramic Bulletin, vol. 54, No. 3, pp. 286-288, (1975).
Yoldas, "Alumina Sol Preparation from Alkoxides" Ceramic Bulletin, vol. 54, No. 3, pp. 289-290, (1975).

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