Preparation method of transparent ceramic optical fiber

Abstract

The invention relates to a preparation method of a transparent ceramic optical fiber. The method comprises the following steps: adding a dispersing agent, an organic monomer and a cross-linking agent into deionized water to prepare a premixed solution; adding ceramic powder into the premixed solution, and carrying out ball milling to prepare a water-based material body; filtering, sequentially adding single-walled carbon nanotubes, a binder, a plasticizer and a surfactant into the material body, and uniformly stirring and mixing; vacuumizing, stirring and degassing, adding an initiator, and uniformly stirring and mixing; extruding a continuous ceramic optical fiber wet blank through an extrusion hole, drying the optical fiber wet blank, calcining and discharging glue, and cooling to room temperature along with the furnace; after vacuum sintering, cooling to room temperature along with a furnace, and annealing in an air atmosphere to obtain a transparent ceramic optical fiber primary product; and polishing the surface and the end face of the transparent ceramic optical fiber primary product by using a femtosecond laser vortex beam with orbital angular momentum of -5 to +5 to obtain a ceramic optical fiber finished product. According to the method, continuous long fibers can be prepared, the uniformity, compactness and mechanical property of the optical fibers can be improved, and large-area processing of fine structures is achieved.

Description

Technical field[0001]The present invention relates to the field of transparent ceramic preparation, and more particularly to a method of preparing a transparent ceramic fiber.Background technique[0002]The fiber laser has a smaller, lighter, high power advantage than other lasers, with fiber as a gain medium facilitating the development of a more sound and more reliable laser optical system. At present, the more mature fiber gain medium is quartz glass fiber, which can achieve high power in the wide band range, but the low thermal conductivity of silica can cause a high thermal gradient when the fiber is operating at high power, resulting in mechanical Stress deterioration and heat lens effect, ultimately reduce the quality of the beam. Extended fiber length can improve these problems, but in single mode mode, there will be problems such as stimulant (SRS) and protoconial scattering (SBS). Therefore, it is difficult for traditional quartz fibers to meet future requirements for laser ...

AI Technical Summary

Problems solved by technology

[0005] The preparation of ceramic precursors by sol-gel method combined with electrospinning molding process is currently an effective method for preparing ceramic optical fibers, but this method usually requires the use of expensive metal alkoxides or metal organic salts as precursors, and the finished optical fiber is usually shorter. , poor uniformity and compactness

Authorized notification numbers CN104451953B and CN110885244B respectively disclose a preparation method of a transparent ceramic optical fiber, respectively adopting the method of grout casting and gel injection molding to prepare a certain length of ceramic optical fiber, but these solutions cannot realize the preparation of continuous long fiber , and both depend on the design of the mold, and are limited by the mold, so that there are more organic additives, which are difficult to remove and cause defects such as cracks, so they cannot be extended to industrial production

[0006] In addition, brittleness is a fatal weakness of ceramic optical fiber. Due to the large aspect ratio of ceramic optical fiber, it is easy to crack or even break when subjected to certain stress under external conditions, resulting in fiber failure, and transparent ceramic optical fiber is extremely sensitive to surface and internal defects. , long polishing time, slight scratches, high surface roughness, uneven polishing, etc. are all important factors affecting the optical performance of optical fibers

Therefore, commonly used methods such as mechanical polishing, ultrasonic polishing, and fluid polishing are not suitable for surface polishing of ceramic optical fibers, which also leads to great difficulty in the overall preparation process of ceramic optical fibers.

Ordinary laser polishing processing technology uses two-photon polymerization to produce a solid spot focused on the surface of the material. In order to achieve the purpose of uniformly polishing the curved surface, strict requirements are placed on precision control devices. The processing efficiency is low, and it is difficult to realize large-area processing of fine structures.

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