Large-mode active optical fiber and manufacture method thereof

Abstract

The invention relates to optical fiber and a manufacture method thereof, in particular to large-mode active optical fiber and a manufacture method thereof. The large-mode active optical fiber is formed by drawing a fiber core and a quartz glass inner cladding, a quartz glass outer cladding and a coating which are sequentially coated on the outer surface of the fiber core, wherein the fiber core is formed by depositing, melting and collapsing silicon tetrachloride doped with rare-earth ions in a quartz glass tube; the refractive index of the fiber core is a gradually changed refractive index, and a fiber core refractive index section parameter alpha is not smaller than 1 and not larger than 3; and the appearance of the quartz glass inner cladding is in a regular gengon shape. The large-mode active optical fiber has the advantages of large mode and similar single-mode output, improves the capacity of bearing laser power and the energy storage density of the active optical fiber, improves the light beam quality of output laser, solves the problem of hollow ring of the output laser, greatly improves the reliability of high-power optical fiber laser devices and the utilization rate of raw materials and reduces the manufacture cost.

Description

technical field

[0001] The invention relates to an optical fiber and a manufacturing method thereof, in particular to a large mode field active optical fiber and a manufacturing method thereof. Background technique

[0002] The technical terms involved in the present invention are explained as follows:

[0003] Deposition: the process in which optical fiber raw materials undergo chemical reactions in a certain environment and generate doped quartz glass;

[0004] Melting: the process of gradually firing the deposited hollow glass tube into a solid glass rod under a certain heat source;

[0005] Sleeve: a high-purity quartz glass tube with a certain cross-sectional area and uniform size;

[0006] Substrate tube: high-purity quartz glass tube for deposition;

[0007] Refractive Index Profile (RIP): The relationship between the refractive index of an optical fiber or an optical fiber preform (including an optical fiber core rod) and its radius;

[0008] Absolute refractive ...

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