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Resonantly pumped Tm-doped fiber laser with >90% slope efficiency
Optics Letters
|February 4, 2014
Summary
Researchers achieved record slope efficiency in a thulium-doped fiber laser using in-band resonant pumping. This method efficiently generated 2-micron wavelength light, demonstrating potential for high-power applications.
Area of Science:
- Laser Physics
- Optical Engineering
- Materials Science
Background:
- Thulium-doped fiber lasers are crucial for generating light in the 2-micron spectral region.
- Efficient pumping is essential for maximizing laser performance and minimizing thermal effects.
- In-band pumping offers potential advantages over traditional methods for thulium-doped fiber lasers.
Purpose of the Study:
- To demonstrate the highest reported slope efficiency for a thulium-doped fiber laser in the 2-micron region.
- To investigate the effects of resonant pumping on thulium-doped fiber.
- To analyze the scalability of resonant pumping for high-power laser generation.
Main Methods:
- Utilized a 1908 nm thulium-doped fiber laser as an in-band pump source.
- Employed a resonant-pumping approach to excite the thulium-doped fiber.
- Analyzed laser output power, optical efficiency, and slope efficiency with respect to launched pump power.
Main Results:
- Achieved 1.43 W of output power at 2005 nm.
- Recorded an optical efficiency of 81.25%.
- Demonstrated a slope efficiency of 90.2% with respect to launched pump power, believed to be the highest reported.
Conclusions:
- The resonant-pumping approach enables highly efficient operation of thulium-doped fiber lasers.
- This method effectively mitigates bleaching effects in the gain medium.
- The demonstrated technique shows strong potential for scaling to high power levels while maintaining efficiency.
