Chemistry: electrical and wave energy – Apparatus – Coating – forming or etching by sputtering
Patent
1977-10-20
1980-02-26
Levy, Stewart J.
Chemistry: electrical and wave energy
Apparatus
Coating, forming or etching by sputtering
204 38A, 204 58, 428469, G02B 514, C25D 500
Patent
active
041903153
ABSTRACT:
A light transmission guide comprising an anodic film of light transmitting material having a first anodised portion with a relatively high refractive index and at least a second portion with a relatively low refractive index, in which anodic film the increase in refractive index from said relatively high to said relatively low value is smooth and continuous in the vicinity of an interface between the first and second anodised portions, and in which the outer surface of said anodic film possesses a minimum amount of structural discontinuity on an atomic scale.
REFERENCES:
patent: 2995502 (1961-08-01), Ramirez et al.
patent: 3820871 (1974-06-01), Croset et al.
Hensler et al. "Optical Propagation in Sheet and Pattern Generated Films of Ta.sub.2 O.sub.5 " in Applied Optics vol. 10, No. 5, May 1971.
Lee et al. "Tantalum Oxide Light Guide on Lithium Tantalate" Appl. Phys. Letts, vol. 25, No. 3., Aug. 1974, pp. 164-166.
Ingrey et al. "Variable Refractive Index and Birefringent Waveguides by Sputtering Tantalum in O.sub.2 --N.sub.2 Mixtures" Applied Optics, vol. 4, No. 9, Sep. 1975, pp. 2194-2198.
Brettle Jack
Jackson Norman F.
Levy Stewart J.
Plessey Handel und Investments A.G.
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