Method of producing a glass article having a graded refractive i

Details Method of producing a glass article having a graded refractive i Method of producing a glass article having a graded refractive i

1979-01-29

1981-11-24

Fisher, Richard V.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 3013, 65 31, C03B 37025, C03B 37075, C03C 2100

Patent

active

043022316

ABSTRACT:
A method of producing a glass article having a graded refractive index profile of a parabolic nature is disclosed. The method comprises soaking a preform having a porous matrix with interconnected pores into a stuffing solution containing at least one index modifying dopant of predetermined solubility in the stuffing solution for a time interval to fill the pores with the dopant solution, precipitating the dopant into the porous matrix approximately uniformly throughout, soaking the preform into a solvent solution having a solubility for the dopant lower than the solubility of the dopant in the stuffing solution for a time interval sufficient to cause substantially all of the dopant to redissolve and for diffusion to take place out of the porous matrix in such a way that the dopant concentration decreases as a function of radial distance from the central axis, precipitating the dopant in the porous matrix by reducing the temperature of the preform to a level such that the dopant is precipitated out of solution, removing the solvent and where necessary decomposition products from the preform, and heating to consolidate the preform to produce a glass article having a graded refractive index profile of the parabolic nature.

REFERENCES:
patent: 2522524 (1950-09-01), Lukes
patent: 3859073 (1975-01-01), Schultz
patent: 3938974 (1976-02-01), Macedo et al.
patent: 4061486 (1977-12-01), Jahn
patent: 4073579 (1978-02-01), Deeg et al.
patent: 4110093 (1978-08-01), Macedo et al.
patent: 4110096 (1978-08-01), Macedu et al.
patent: 4188198 (1980-02-01), Macedo et al.
patent: 4225330 (1980-09-01), Kakuzen et al.

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