Method for preparing rare earth doped silica glass microstructure optical fiber by laser melting technology

Abstract

The invention discloses a method for preparing a rare earth-doped quartz glass microstructure optical fiber by adopting laser melting technology. In the method, the steps include: powder making, smelting, treatment of doped rods, preparation of optical fiber prefabricated rods, and drawing of rare earth-doped quartz glass microstructure optical fibers. Also disclosed is the application of uniformly doped quartz glass rods in all solid-state lasers and microstructured optical fibers. Also disclosed is a laser smelting system, which includes a powder feeder, a laser light source, a mother bar, a fixture, a motor, and a guide rail. The rare earth doped powder and quartz glass microstructure optical fiber prepared by the invention can realize uniform doping of various rare earth ions, and the doped microstructure optical fiber prepared by the invention has an effective doping concentration of rare earth ions exceeding 10000ppm.

Description

technical field [0001] The invention relates to a method for preparing a rare earth-doped quartz glass microstructure optical fiber by adopting laser melting technology. Background technique [0002] Compared with traditional solid-state lasers, fiber lasers have many advantages such as high efficiency, compactness, tunability, excellent beam quality, good heat dissipation, high gain, and low laser threshold, so they are widely used in industrial processing, material processing, military defense and other fields . However, with the development and application of industrial processing such as laser cutting and welding and high-energy laser weapons, higher requirements are put forward for the higher power output of fiber lasers and the quality of laser beams, but high-power fiber lasers also bring fiber materials. For new problems such as laser damage and nonlinear effects, using a fiber with a large core diameter can effectively improve the problem of laser damage, and short...

AI Technical Summary

Problems solved by technology

With the emergence of optical fiber designs such as large mode fields, new requirements are put forward for the process of preparing optical fiber preforms, such as larger core rods, higher doping concentrations, uniform distribution of doping ions, and refraction of doping materials. The precise control of the rate, the co-doping of multiple rare earth ions, etc., which are very important for the currently used technologies, such as: modified vapor deposition (MCVD), external vapor deposition (OVD), vapor axial deposition (VAD) and plasma chemistry Vapor phase deposition process (PCVD), sol-gel method (SOL-GEL), etc. will be difficult to realize, thus limiting the further development of MSF with high doping concentration

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