C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
49/77
C03C 23/00 (2006.01) C02F 5/14 (2006.01) C03B 37/016 (2006.01)
Patent
CA 1119808
METHOD OF PRODUCING A GLASS ARTICLE HAVING A GRADED REFRACTIVE INDEX PROFILE OF A PARABOLIC NATURE ABSTRACT OF THE DISCLOSURE: 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 decomposi- tion 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.
342760
Macedo Pedro B.
Murai Shigeo
Simmons Joseph H.
Litovitz Theodore A.
Macedo Pedro B.
Primak & Co.
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