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High-power diode-pumped fiber laser operating at 3 μm
Jianfeng Li1, Darren D Hudson, Stuart D Jackson
1Institute of Photonics and Optical Science and the Centre for Ultrahigh Bandwidth Devices for Optical Systems, School of Physics, University of Sydney, Camperdown, Australia.
Optics Letters
|September 21, 2011
Summary
This study demonstrates the first watt-level fiber laser operating in the mid-infrared (mid-IR) using a Ho³⁺-doped fluoride glass fiber. The cascade mode laser achieved 0.77 W output power at 2.05 μm and 3.002 μm.
Area of Science:
- Laser Physics
- Materials Science
Background:
- Ho³⁺-doped fluoride glass fiber lasers are promising for mid-infrared applications.
- Cascade operation in these lasers allows for tunable output wavelengths.
Purpose of the Study:
- To demonstrate a high-power diode-cladding-pumped Ho³⁺-doped fluoride glass fiber laser operating in cascade mode.
- To achieve watt-level output power in the mid-infrared region.
Main Methods:
- Utilized a diode-cladding-pumped Ho³⁺-doped fluoride glass fiber.
- Operated the laser in cascade mode, utilizing both ⁵I₆→⁵I₇ and ⁵I₇→⁵I₈ transitions.
- Employed a long fiber length to manage the threshold of the ⁵I₇→⁵I₈ transition.
Main Results:
- Achieved 0.77 W output power at 2.05 μm (⁵I₆→⁵I₇ transition) with a 12.4% slope efficiency.
- Achieved 0.24 W output power at 3.002 μm (⁵I₇→⁵I₈ transition) with a 5.2% slope efficiency.
- Demonstrated the first watt-level fiber laser operating in the mid-IR at 3.002 μm.
Conclusions:
- The developed Ho³⁺-doped fiber laser system is capable of watt-level output power in the mid-IR.
- Cascade operation provides a pathway to achieve tunable mid-IR laser output from fiber systems.
- This work paves the way for advanced mid-IR fiber laser sources.
