Accession Number : ADD007111

Title :   Laser Photochemical Synthesis and Coating of Optical Fiber.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Merritt,James A

Report Date : 22 Oct 1979

Pagination or Media Count : 4

Abstract : Disclosed is a method to prepare and coat an optical fiber with Si3N4. The Si3N4 is synthesized from SiF4 + NH3 and/or SiH4 + NF3 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 degrees C in a standard fiber drawing furnace. Immediately after drawing of fiber, the fiber is passed through a chamber with a controlled atmosphere containing SiX4 and NX3 gases, wherein X equals hydrogen or fluorine. A laser is used to irradiate the atmosphere and the Si3N4 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. (Author)

Descriptors :   *Patent applications, *Photochemical reactions, *Lasers, *Synthesis(Chemistry), *Coatings, Optical materials, Fibers, Controlled atmospheres, Strength(Mechanics), Seals(Stoppers), Fluorides, Fiber optics transmission lines, Thickness, Gases, Silicon coatings, Inventions, Furnaces

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE