Method of enlarging end of capillary tube bore

Details Method of enlarging end of capillary tube bore Method of enlarging end of capillary tube bore

C - Chemistry, Metallurgy

03

C

149/17

C03C 15/00 (2006.01) G02B 6/28 (2006.01) G02B 6/36 (2006.01) G02B 6/38 (2006.01)

Patent

CA 2006345

A method of forming a tapered aperture at the end of a capillary tube bore. A gaseous etchant such as a fluorine-containing compound flows through the bore and emanates from the first end of the tube. That tube end is heated to create a longitudinal temperature gradient. The gaseous etchant reacts with the tube and enlarges that portion of the bore at the first end. The resultant tapered aperture has a surface smoothness and shape that greatly facilitates the insertion of optical fibers during the fabrication of optical energy transfer devices.

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