1.Mid-infrared fiber super fluorescent light source

Fiber superfluorescence light sources have the advantages of compact structure, easy integration, high environmental stability, and wide fluorescence spectrum. Compared with lasers, they have low coherence, no self-pulse, no relaxation oscillation, no mode competition, and extremely high temporal stability. Due to its characteristics, it has been widely used in fiber optic sensing, fiber optic gyroscopes, low-coherence optical imaging, gas sensing, optical device testing and other fields. The 1.0μm , 1.5μm , and 2.0μm band optical fiber superfluorescence light sources independently developed by the laboratory have the advantages of high power, large bandwidth, and high stability. The 3dB spectral bandwidth can reach up to 100nm , and the industrialization of light sources has been realized. Low-power light sources have been used in fiber optic device testing.

2.Thulium-doped fiber laser

The spectrum of thulium-doped laser has a large tunable bandwidth, covering 1800-2100 nm, 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 in 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.

3.Preliminary research basis and results

Mid-infrared thulium-doped superfluorescence light source

Low power mid-infrared thulium-doped fiber laser

High power thulium doped fiber laser prototype 50-150W

50W , 1550nm fiber laser

Air-cooled and water-cooled thulium-doped fiber lasers

4. Future research plans and expected results

Optimize the thulium-doped fiber laser system, complete the finalization of 50W air-cooled laser and 100W water-cooled laser, and apply them 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.