Method for preparing microfine optical fiber by adopting chemical corrosion method

Abstract

The invention relates to a method for preparing a microfine optical fiber by adopting a chemical corrosion method. The method comprises the following steps of: arranging a device, corroding an outer resin covering layer of an optical fiber to be processed to take the optical fiber subjected to the removal of the resin covering layer, wherein the device comprises an ultrasonic cleaning machine, a container in which a concentrated sulfuric acid solution is placed, a container in which deionized water is placed, and a container in which a hydrofluoric acid solution is placed; soaking the opticalfiber subjected to the removal of the resin covering layer in deionized water, cleaning to remove the concentrated sulfuric acid solution resided on the optical fiber and then taking out; placing thecontainer in which the hydrofluoric acid solution is placed in a cleaning groove of the ultrasonic cleaning machine, adding a proper quantity of water in the cleaning groove, immersing the optical fiber subjected to cleaning of the deionized water in a hydrofluoric acid solution, opening a switch of the ultrasonic cleaning machine, corroding the optical fiber in the hydrofluoric acid solution, and taking the optical fiber out, wherein the height of the water level is lower than the top end of the container; and placing the optical fiber corroded by the hydrofluoric acid solution in the deionized water and then taking out. The invention can be widely applied to preparation of micro fine optical fibers.

Description

technical field [0001] The invention relates to a method for preparing microfibers, in particular to a method for preparing microfibers by chemical corrosion. Background technique [0002] Micro-fibers are mainly used in the field of micro-nano processing and optical waveguide transmission. The existing micro-fiber preparation methods are mainly mechanical stretching and chemical corrosion. Heat the middle part of the optical fiber, and at the same time apply an external force to both ends to stretch it evenly and slowly. As the stretching progresses, the fiber will gradually become thinner at the heating point until it is pulled off. Tapered fiber optic probe, the radius of curvature of the tip is on the order of nanometers. However, the mechanical stretching method cannot obtain an optical fiber with a certain length and uniform diameter. The most widely used preparation method of micro-optical fiber at this stage is the chemical etching method. The principle of the chem...

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Problems solved by technology

[0003] At present, the use of chemical etching to prepare micro-fibers is still mainly based on the preparation of optical fiber probes. The fiber core is placed in a hydrofluoric acid solution, and the optical fiber placed under the liquid surface is completely etched. Using the principle of capillary action on the liquid surface, Realize the preparation of a tapered needle tip with a certain taper at the liquid surface, but there is no method for preparing a micro-fiber with a certain length and uniform diameter

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