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Monolithic highly efficient 272 W nested-ring structured-core thulium fiber laser at 1940 nm.
Optics Letters
|September 16, 2025
Summary
Researchers developed a novel thulium-doped fiber laser. This laser achieved a record 272W output power and high efficiency, advancing high-power fiber laser technology.
Area of Science:
- Laser Physics
- Materials Science
Background:
- Thulium (Tm) fiber lasers are crucial for applications requiring specific wavelengths.
- Achieving high output power and efficiency in single-mode Tm fiber lasers remains a challenge.
Purpose of the Study:
- To demonstrate a high-power monolithic laser oscillator system using a novel thulium-doped silica fiber.
- To investigate the performance of a Tm fiber with a non-uniform core doping profile.
Main Methods:
- Utilized a novel thulium-doped silica fiber with a non-uniform core doping profile.
- Constructed a monolithic laser oscillator system.
Main Results:
- Achieved a continuous-wave (CW) output power of 272 W at 1940 nm.
- Obtained slope efficiencies of 68% (launched) and 71% (absorbed) pump power.
- Generated the highest reported output power from a single-mode, small-core (<15 µm diameter) non-pedestal fiber laser.
- Achieved the maximum reported slope efficiency for a single-mode thulium fiber laser above 100 W output power.
Conclusions:
- The novel Tm fiber design with a non-uniform doping profile is effective for high-power laser generation.
- This work sets a new benchmark for single-mode thulium fiber laser performance.
