Preparation method of taper-core optical fiber with gradually-changed core-to-package ratio and taper-core optical fiber

Abstract

The invention belongs to the technical field of optical fiber manufacturing, and particularly discloses a preparation method of a taper-core optical fiber with a gradually-changed core-to-package ratio and the taper-core optical fiber. The method comprises the following steps: depositing a glass particle loose layer on the inner wall of a reaction tube; performing rare earth ion doping on the glass particle loose layer; drying the reaction tube, conducting sintering at high temperature, so as to vitrify the glass particle loose layer, conducting fusing to form a solid preform core rod, and then polishing the solid preform core rod to obtain a conical core rod with a specified taper angle; and conducting processing to obtain a cylindrical glass rod which is provided with a conical hollow hole, combining the glass rod with the conical hollow hole with a conical core rod to obtain a conical core active optical fiber preform, and putting the conical core active optical fiber preform into a wire drawing tower for drawing to obtain the conical core optical fiber with a gradually changed core-to-cladding ratio. The taper core optical fiber is prepared by the method. The core-to-package ratio of the prepared taper core optical fiber with the gradually-changed core-to-package ratio is gradually changed along with the length of the optical fiber, pump light absorption of the optical fiber can be improved, optical fiber heat production can be balanced, and laser output power can be improved.

Description

technical field

[0001] The invention belongs to the technical field of optical fiber manufacturing, and more specifically relates to a preparation method of a tapered-core optical fiber with a gradually changing core-to-clad ratio and the tapered-core optical fiber. Background technique

[0002] High-power narrow-linewidth fiber lasers have the advantages of small size, light weight, good beam coherence, good beam quality, and excellent thermal management performance. They are widely used in industrial processing, intelligent manufacturing, biomedicine, and beam synthesis. With the expansion of application fields, higher requirements are put forward for the output power and beam quality of high-power narrow-linewidth fiber lasers. At present, the output power of a single high-power narrow-linewidth fiber laser has reached the kilowatt level. As the power is further increased, nonlinear effects and thermally induced mode instability effects become the main factors that limit...

Images