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All-fiber DFB laser operating at 2.8 μm
Optics Letters
|December 23, 2014
Summary
This study demonstrates a single-frequency fiber laser emitting at 3 µm. This mid-infrared laser achieved 12 mW output power with a narrow linewidth, paving the way for frequency references.
Area of Science:
- Laser Physics
- Optical Engineering
- Materials Science
Background:
- Mid-infrared (mid-IR) lasers are crucial for spectroscopy and sensing.
- Developing compact, stable, and tunable mid-IR sources remains a challenge.
Purpose of the Study:
- To demonstrate single-frequency laser emission from a distributed feedback all-fiber laser operating near 3 µm.
- To characterize the output power and linewidth of the developed fiber laser.
Main Methods:
- Fabrication of a π-phase-shifted fiber Bragg grating in erbium-doped fluoride fiber using femtosecond laser inscription.
- Utilizing a dithering phase-mask technique for grating inscription.
- Employing a multimode pumping scheme for laser operation.
- Characterizing the laser linewidth using a heterodyne technique.
Main Results:
- Achieved single-frequency laser emission at 2794.4 nm.
- Obtained a maximum continuous-wave (CW) output power of 12 mW.
- Measured a narrow linewidth below 20 kHz.
Conclusions:
- The developed all-fiber laser represents a significant advancement for mid-infrared applications.
- This work contributes to the development of active frequency references in the mid-IR spectrum.
- The demonstrated laser technology shows promise for high-resolution spectroscopy and optical sensing.
