Method for preparing doped yttrium aluminum garnet single crystal fiber by performing a cylindrical surface polishing operation and growing a cladding layer

1. A method for preparing a doped Yttrium Aluminum Garnet (YAG) single crystal fiber, comprising:

preparing a doped YAG crystal ingot;

preparing a doped YAG crystal rod by performing an operation on the doped YAG crystal ingot, the operation including at least one of a cutting operation, a grinding operation, or a polishing operation;

preparing a doped YAG single crystal fiber core by immersing at least a portion of the doped YAG crystal rod in an acid solution and reacting for a preset time under a preset condition, the preset condition including a preset temperature and a first preset magnetic stirring rate, wherein

the preset temperature is in a range of 200 to 300° C.,

the first preset magnetic stirring rate is in a range of 200 to 300 revolutions per minute (rpm);

performing a cylindrical surface polishing operation on the doped YAG single crystal fiber core by stirring a polishing liquid at a second preset magnetic stirring rate, wherein

the polishing liquid includes a polishing powder,

the second preset magnetic stirring rate is in a range of 300 to 500 rpm,

the cylindrical surface polishing operation includes:

immersing the doped YAG single crystal fiber core into a container containing the polishing liquid by using a clamp,

placing the container on a magnetic stirrer, and

performing the cylindrical surface polishing operation on the doped YAG single crystal fiber core by causing a stirring magnet of the magnetic stirrer to rotate in the container and to drive the polishing liquid to rotate;

placing the doped YAG single crystal fiber core into a growth zone of a growth chamber and placing a raw material into a dissolution zone of the growth chamber;

adding a mineralizer into the growth chamber to cause the mineralizer to immerse the raw material and the doped YAG single crystal fiber core;

heating the growth zone and the dissolution zone by a two-stage heating device, respectively, a temperature of the dissolution zone being higher than a temperature of the growth zone; and

preparing a doped YAG single crystal fiber by growing a YAG single crystal fiber cladding on a surface of the doped YAG single crystal fiber core based on the doped YAG single crystal fiber core and the raw material under a preset pressure.

2. The method of claim 1 , wherein the acid solution includes at least one of a concentrated phosphoric acid solution, a concentrated sulfuric acid solution, or a concentrated hydrochloric acid solution.

3. The method of claim 1 , further comprising:

rinsing the doped YAG single crystal fiber core using a cleaning solution.

4. The method of claim 1 , wherein a mass fraction of the polishing powder in the polishing liquid is in a range of 5% to 10%.

5. The method of claim 4 , wherein the polishing powder includes at least one of silicon oxide or corundum.

6. The method of claim 1 , wherein the mineralizer includes a potassium carbonate (K 2 CO 3 ) solution, a sodium carbonate (Na 2 CO 3 ) solution, a potassium fluoride (KF) solution, an ammonium fluoride (NH 4 F) solution, a potassium hydroxide (KOH) solution, or a sodium hydroxide (NaOH) solution.

7. The method of claim 1 , wherein before heating the growth zone and the dissolution zone by a two-stage heating device, respectively, the method further comprises:

sealing the growth chamber;

placing the sealed growth chamber into a safety device;

sealing the sealed growth chamber and the safety device as a whole; and

placing the sealed whole into the two-stage heating device.

8. The method of claim 1 , wherein

the temperature of the dissolution zone is in a range of 635 to 650° C., and

the temperature of the growth zone is in a range of 610 to 630° C.

9. The method of claim 1 , wherein the preset pressure is in a range of 120 to 160 MPa.