The spectrum of thulium-doped laser has a large tunable bandwidth, covering 1800-2100nm, it is in the absorption peaks of water molecules, carbon dioxide, ammonia, etc., and is also in the intrinsic absorption band of polymer materials, therefore, thulium-doped fiber laser can be used in polymers Material processing, biomedicine, gas sensing and other fields. At the same time, it is at the absorption peak of mid-infrared laser crystals and can be used as a pump source for mid-infrared band lasers. The thulium-doped fiber laser developed by the laboratory has achieved a power output of hundreds of watts, and successfully completed laser transmission welding of transparent polymer materials. It is currently conducting research on medical applications.

1) Preliminary research basis and results 

   Physical prototype:

2)Research plan and expected results 

Optimize the thulium-doped fiber laser system and complete the finalization of 50W air-cooled laser and 100W water-cooled laser for application in the field of material processing. 

Develop high-power quasi-continuous thulium-doped fiber lasers for use in laser medical fields (lithotripsy). 

Carry out research on engineering technology of pulsed mid-infrared fiber lasers and realize physical prototypes for application in material processing and medical fields. 

Carry out technical optimization of key components of mid-infrared optical fiber devices to achieve high-power, low-loss coupling of mid-infrared lasers with fluoride fibers, sapphire fibers, etc.