Laser photochemical synthesis coating of optical fiber

Details Laser photochemical synthesis coating of optical fiber Laser photochemical synthesis coating of optical fiber

1979-10-22

1980-10-14

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 2, 65 3C, 65 30R, 427163, C03C 2502

Patent

active

042279070

ABSTRACT:
Disclosed is a method to prepare and coat an optical fiber with Si.sub.3 ub.4. The Si.sub.3 N.sub.4 is synthesized from SiF.sub.4 +NH.sub.3 and/or SiH.sub.4 +NF.sub.3 by laser photochemical reaction (LPR) techniques in a controlled atmosphere chamber. The silicon fiber which is a representative optical fiber is drawn from a preform at about 2000.degree. C. in a standard fiber drawing furnace. Immediately after drawing of fiber, the fiber is passed through a chamber with a controlled atmosphere containing SiX.sub.4 and NX.sub.3 gases, wherein X equals hydrogen or fluorine. A laser is used to irradiate the atmosphere and the Si.sub.3 N.sub.4 is coated on the optical fiber to a thickness of about 0.02-0.20 micrometer which hermetically seals the fiber and enhances and maintains the mechanical strength thereof.

REFERENCES:
patent: 4118211 (1978-10-01), Coin

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