Method of making optical devices

Details Method of making optical devices Method of making optical devices

1979-05-31

1981-02-17

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 13, 65 18, 65110, 427163, C03B 3700, C03C 2502

Patent

active

042512514

ABSTRACT:
A method of making solid glass articles by the flame hydrolysis technique. First and second layers of glass soot produced by a flame hydrolysis are deposited on the outside surface of a mandrel to form a porous preform. The refractive index of the soot particles of the first layer is greater than that of the soot of the second layer, and the soot of the first layer has a viscosity lower than that of the second layer. The mandrel is removed, and the soot preform is subjected to a high temperature whereby it is consolidated to form a dense glass blank. The glass surface tension and the relative viscosities of the inner and outer portions of the preform cause the aperture to close during the consolidation process. The resultant blank may be heated and drawn into a filament, or it may be sliced into optical windows, lenses or the like.

REFERENCES:
patent: 3249414 (1966-05-01), Hamilton
patent: 3859073 (1975-01-01), Schultz
patent: 3933453 (1976-01-01), Burke et al.
patent: 3961926 (1976-06-01), Asam
patent: 4009014 (1977-02-01), Black et al.
patent: 4123483 (1978-10-01), Nakahara et al.
"Laboratory Glass-Working", A. J. B. Robertson et al., pp. 58-59, Acedemic Press Inc., London, 1957.

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