Method for efficiently preparing doped optical fibre preform and doped optical fibre preform

A method for efficiently preparing a doped optical fibre preform, the method comprising the following steps:

• S1, mixing a rare earth material or a functional metal material with a co-doping agent in a certain proportion, and adding a solvent to formulate a doping solution;
• mixing and evenly stirring a high-purity quartz powder having a purity of over 99% with the doping solution to obtain a doped precursor;
• drying the doped precursor at a temperature of 100° C.-150° C. for 12-48 hours, crushing the doped precursor, and screening the crushed precursor through a mesh sieve with over 150 meshes to obtain a doped quartz powder;
• S2, disposing a target rod in a plasma outward spraying deposition device, introducing the doped quartz powder, oxygen and/or other gaseous co-doping substances into a plasma heating zone in the plasma outward spraying deposition device, and depositing the doped quartz powder onto the surface of the target rod in a certain proportion to form a doped core layer;
• stopping introduction of the doped quartz powder, introducing the high-purity quartz powder, oxygen and/or other gaseous co-doping substances, and depositing the high-purity quartz powder onto the surface of the doped core layer in a predetermined proportion to form a quartz outer cladding;
• and
• S3, removing the target rod, and gradually collapsing the entirety formed from the doped core layer and the quartz outer cladding at a high temperature of 900° C.-1800° C. to obtain the doped optical fibre preform.