Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1992-11-16
1994-06-07
Lindsay, Robert L.
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 6051, 65 314, 65117, C03C 1500
Patent
active
053186141
ABSTRACT:
Optical waveguide paths are formed under the surface of a glass substrate by a method comprising (a) forming by ion-exchange a dopant ion path on a first substrate surface, (b) applying an electrode to the second surface, (c) contacting the first surface with a molten salt bath, and (d) applying an electrical field across the substrate to drive the dopant ions deeper into the substrate. The current resulting from high fields can overheat the substrate, thereby causing substrate warping and burying of paths to uneven depths. One aspect of the invention involves cooling the substrate by flowing the molten salt along the first surface of the substrate at a sufficient rate of flow to adequately decrease its temperature and by rapidly flowing the furnace atmosphere over the surface of the substrate. A further aspect of the invention involves initially applying a voltage V.sub.i across the substrate, allowing the current to increase to a predetermined level I.sub.m, and maintaining the flow of current at the predetermined level I.sub.m by decreasing the applied voltage at a rate necessarry to maintain the current at level I.sub.m. The electrical field remains for a predetermined period of time to bury the ion path a predetermined depth.
REFERENCES:
patent: 3711393 (1973-01-01), Garfinkel
patent: 3773488 (1973-11-01), Tran et al.
patent: 3836348 (1974-09-01), Sumimoto et al.
patent: 3880630 (1975-04-01), Izawa
patent: 4309495 (1982-01-01), Ernsberger
patent: 4466820 (1984-08-01), Clarke
patent: 4765702 (1988-08-01), Dohan et al.
patent: 4842629 (1989-06-01), Clemens et al.
patent: 4913717 (1990-04-01), Cooper
patent: 4933262 (1990-06-01), Beguin
patent: 4938836 (1990-07-01), Carenco et al.
patent: 5160360 (1992-11-01), Seki
R. V. Ramaswamy et al., "Ion-Exchanged Glass Waveguides: A Review", Journal of Lightwave Technology, vol. 6, No. 6, Jun. 1988, pp. 984-1002.
L. Ross "Integrated Optical Components in Substrate Glasses", vol. 62, No. 8, Glastechnische Berichte, Aug. 1989, pp. 285-297.
H. J. Lilenhof et al. "Index Profiles of Multimode Optical Strip Waveguides by Field Enhanced Ion Exchange in Glasses", Optics Communications, vol. 35, No. 1, Oct., 1980, pp. 49-53.
A. Miliou et al. "Fiber-Compatible K.sup.+ -Na.sup.+ Ion-Exchanged Channel Waveguides: Fabrication and Characterization", IEEE Journal of Quantum Electronics, vol. 25, No. 8, Aug., 1989, pp. 1889-1897.
Corning Incorporated
Lindsay Robert L.
Simmons, Jr. W. J.
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