What is thulium doped double clad active fiber

In the cutting-edge field of laser technology, thulium doped double clad active fibers are becoming the core driving force for high-power laser output in the 2 micron wavelength band due to their excellent performance, injecting powerful kinetic energy into numerous cutting-edge applications.

Its most dazzling advantage lies in its precise alignment with the water absorption peak of biological tissues. The 2-micron wavelength matches the height of the water absorption peak in biological tissues, enabling highly efficient localized absorption of laser energy and minimal thermal damage areas. This characteristic makes it an ideal light source for precision medical procedures such as laser surgery (such as urology and orthopedics) and tissue ablation, significantly improving surgical accuracy and safety.
At the same time, the laser output by the fiber is in the important human eye safe wavelength band (atmospheric transmission window) and exhibits excellent atmospheric penetration capability. This makes it an excellent light source choice for applications such as LiDAR, remote sensing detection, and free space optical communication, demonstrating enormous potential in fields such as environmental monitoring, unmanned driving, and national defense security.
In the field of industrial processing, thulium doped fiber lasers perform outstandingly. The 2-micron laser is particularly suitable for plastic welding and precision cutting, with efficient action on polymer materials and precise control of the heat affected zone. Its unique wavelength also provides an ideal pump source for mid infrared nonlinear frequency conversion, helping to expand laser output with a wider spectrum.
The double clad structure design lays the foundation for its high power output. The inner cladding significantly improves the coupling efficiency of pump light, and combined with the wide absorption band of thulium ions themselves, it can efficiently utilize inexpensive high-power multimode laser diodes for pumping, easily achieving stable and high beam quality 2-micron continuous or pulsed laser output of hundreds of watts or even kilowatts.
Thulium doped double clad active fiber, with its unique wavelength advantage and strong power scalability, has become a key cornerstone for unlocking cutting-edge medical, advanced industrial manufacturing, next-generation detection and communication technologies, continuously driving innovation and breakthroughs in mid infrared laser technology.

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