Single crystal optical fiber and preparation method thereof

Abstract

The invention discloses a single crystal optical fiber and a preparation method thereof. The single crystal optical fiber comprises an optical fiber core, inner cladding and outer cladding, and the optical fiber core is a solid single crystal fiber. The preparation method comprises the following steps: preparing a plurality of tubular glass preform rods having mutually-matched inner and outer diameters; performing drawing on the preform rods to obtain glass cladding having a two-layer structure; and inserting the solid single crystal fiber into the inner cladding, and performing heating tapering to obtain the single crystal optical fiber having the glass cladding. According to the single crystal optical fiber and method provided by the invention, materials, quantities, sizes and positionsof the tubular components adopted in the method are adjustable, the optical and thermal properties of the tubular components can be matched with a single crystal material to the greatest extent, so that the mode quality and high power operation of the single crystal optical fiber can be ensured; and the single crystal optical fiber has the advantages of a simple structure and convenient preparation, and the method breaks a bottleneck of difficult preparation of cladding of a conventional single crystal optical fiber, and is an ideal cladding preparation solution for the single crystal opticalfiber.

Description

technical field [0001] The invention belongs to the field of crystal optical fibers, and more specifically relates to a single crystal optical fiber and a preparation method thereof. Background technique [0002] Crystal fiber is different from traditional silica fiber. It uses crystal (such as sapphire, YAG, sesquioxide crystal) as the medium and waveguide structure as the beam transmission channel. It is a special structure between traditional fiber and bulk crystal. Therefore, crystal fiber has the advantages of optical fiber and crystal medium at the same time. Compared with traditional silica fibers, crystal fibers have better physical properties. Taking YAG crystal as an example, its thermal conductivity is an order of magnitude higher than that of glass optical fiber, so YAG crystal optical fiber has better heat dissipation performance; secondly, YAG crystal has a melting point of about 2000°C and has a greater damage threshold than silica optical fiber. In addition...

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Problems solved by technology

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a single crystal optical fiber and its preparation method, which aims to solve the problems that the cladding preparation of traditional crystal optical fibers has high requirements for experimental equipment and reaction conditions, and the preparation process is relatively complicated.

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