In today's rapidly evolving technological landscape, the development of laser technology remains a focal point of attention. The thulium-holmium co-doped fiber introduced by Changjin Photonics has injected new vitality into the 2μm laser field.

Ⅰ. Breaking Tradition and Leading Innovation

The 2μm laser falls within the eye-safe wavelength range and boasts excellent atmospheric transmittance, as well as strong absorption characteristics by water molecules and polymer materials. This gives it broad application prospects in fields such as biomedical therapy, plastic processing, and environmental monitoring.

Thulium-holmium co-doped fiber is an effective gain medium for generating lasers in the 2–2.2μm wavelength band. By utilizing a mature 793nm pump source, it achieves efficient energy transfer between the 3F4 energy level of thulium ions and the 5I7 energy level of holmium ions. This process enables high-efficiency transitions of holmium ions from the 5I7 to 5I8 energy levels, yielding high-power laser output in the 2–2.2μm band.

Based on the 10/130μm thulium-holmium co-doped fiber, a 793nm LD forward-pumped all-fiber oscillator was built. It achieves an output power of 10.5 W, a slope efficiency of 38.6%, and a central wavelength at 2097.5 nm.

Ⅲ. Wide Applications and Broad Prospects

1. Industrial Field：The 2μm laser can be applied to material cutting, welding, drilling and other processes in industrial processing. The thulium-holmium co-doped fiber from Changjin Photonics will provide more efficient and precise solutions for these applications, driving industrial manufacturing towards a higher level of development.

2. Medical Field: The 2μm laser offers unique advantages in medical surgeries, such as minimal thermal damage to tissues and excellent hemostatic effects. The emergence of thulium-holmium co-doped fiber will bring new opportunities for the development of medical laser equipment, providing patients with safer and more effective treatment methods.

3. Atmospheric Monitoring Field: The 2μm laser can not only be used to detect the concentrations of greenhouse gases such as carbon dioxide and methane in the atmosphere but also has good detection effects on polluting gases such as sulfur dioxide and nitrogen oxides emitted by industries. The thulium-holmium co-doped fiber introduced by Changjin Photonics will provide more powerful tools for environmental protection and climate change research and governance, helping to achieve new breakthroughs in the field of atmospheric monitoring.

         Ⅳ. Changjin Photonics: Unceasing Innovation

        As a company specializing in optical fiber technology research, development, and production, Changjin Photonics has always adhered to innovation-driven development. The newly introduced thulium-holmium co-doped fiber provides a solid and reliable foundation for the 2–2.2μm fiber laser field. Let us jointly anticipate that Changjin Photonics will achieve more breakthroughs, allowing the brilliance of thulium-holmium co-doped fiber to illuminate more domains!

In the future, Changjin Photonics will uphold the spirit of craftsmanship, continue to increase R&D investments, deepen technological innovation, and strive to provide customers with higher-performance and higher-quality special optical fiber products, making greater contributions to the development and application of laser technology. We look forward to joining hands with more partners to jointly promote the vigorous development of fiber laser technology and create new technological glories together.