Method for producing buried regions of raised refractive index i

Glass manufacturing – Processes – With chemically reactive treatment of glass preform

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65 31, 156655, 156663, C03C 2100

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048426296

ABSTRACT:
An improvement for a method of producing buried regions of raised refractive index in a glass member by ion exchange characterized by removing a titanium mask from the glass member after a first ion exchange to raise the refractive index of exposed portions of the glass member with an EDTA disodium etching solution followed by a slight material erosion of the glass after removal of the titanium mask prior to an implementation of a second field-assisted ion exchange.

REFERENCES:
patent: 4084023 (1978-04-01), Dafter, Jr.
patent: 4302231 (1981-11-01), Macedo et al.
patent: 4554050 (1985-11-01), Minford et al.
Okuda et al, "Planar Gradient-Index Glass Waveguide and Its Applications to a 4-Port Branched Circuit and Star Coupler", Applied Optics, vol. 23, No. 11, Jun. 1984, pp. 1745-1748.
Murphy et al, "Integrated Optics Processing: Uses of an EDTA ETCH Solution", Electronics Letters, vol. 20, No. 19, 13 Sep. 1984, pp. 760-761.
Lilienhof et al, "Printed Geodesic Lenses in Glass with Ion-Exchanged Film Waveguides", Electronic Letters, vol. 18, No. 8, 15th Apr., 1982, pp. 344-345.

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