Process for producing transparent glass product having refractiv

Details Process for producing transparent glass product having refractiv Process for producing transparent glass product having refractiv

1986-12-02

1988-08-30

Lacey, David L.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 31, 65 32, 65900, C03C 1500, C03C 1700, C03C 2300, C03C 2500

Patent

active

047674350

ABSTRACT:
A process for producing a transparent glass product having a refractive index gradient by the molecular stuffing method is described. A thallium compound is used as a dopant and, after a concentration gradient of the thallium dopant is formed, the porous glass product is heated up to the temperature region of 350.degree. to 550.degree. C. at a temperature-rising rate of 25.degree. to 150.degree. C./hour in a reducing gas atmosphere and then heat treated above 550.degree. C. in an inert gas atmosphere to collapse micropores in the porous glass product, thereby obtaining a glass product having a refractive index gradient which is transparent and free of light-scattering and coloration. The glass product is suitable as materials (preforms) for optical fibers or materials for rod-shaped lenses, particularly rod-shaped microlenses for microlens arrays and microlenses for coupling an optical fiber and a light source.

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patent: 4525189 (1985-06-01), Ohmi et al.
patent: 4528010 (1985-07-01), Edahiro et al.
patent: 4563205 (1986-01-01), Asahara et al.

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