METHOD FOR EFFICIENT PRODUCTION OF DOPED FIBRE-OPTIC WORKPIECE AND DOPED OPTICAL FIBRE WORKPIECE Russian patent published in 2020 - IPC C03B37/18 G02B6/02 

FIELD: optics.

SUBSTANCE: group of inventions relates to a method of producing a doped workpiece of an optical fibre doped with an optical fibre workpiece. Method of efficiently producing a doped workpiece of an optical fibre involves the following steps: mixing rare-earth material or functional metal material with a salt-forming agent, adding a solvent for preparing an alloying solution, uniformly mixing high-purity quartz powder with a dopant solution to obtain a doped precursor; drying of the doped precursor, milling of the doped precursor and sifting of the milled precursor through the screen for production of doped quartz powder; placing the inoculating rod in the plasma sputtering device, introducing the doped quartz powder, oxygen and/or other gaseous salt-forming substances into the plasma heating zone in the plasma spraying device and depositing the doped quartz powder on the surface of the inoculating rod to form a doped core layer; termination of doped quartz powder introduction, introduction of high-purity quartz powder, oxygen and/or other gaseous salt-forming substances; depositing high-purity quartz powder on the surface of the doped core layer to form a quartz outer shell; removal of inoculating rod and gradual collapse of mould formed of doped core layer and quartz outer shell at high temperature to produce doped optical fibre workpiece. Gaseous salt-forming substances include hexafluoroethane or phosphorus oxychloride.

EFFECT: technical result is reduced introduction of impurities and improved uniformity of doping fibre-optic preforms.

11 cl, 5 dwg, 4 tbl