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High-power single transverse mode random fiber laser based on the coherent feedback
Optics Letters
|August 2, 2025
Summary
High-power random fiber lasers (RFLs) are now more compact. This study demonstrates a single-stage, ~1.5-μm band RFL using a novel scattering-enhanced structure for improved performance and stability.
Area of Science:
- Laser Optics
- Photonics
- Materials Science
Background:
- Compact, high-performance random fiber lasers (RFLs) present significant challenges in laser optics.
- Existing RFL designs often struggle with nonlinear accumulation and mode competition, limiting power and spectral stability.
Purpose of the Study:
- To develop a high-power, single transverse mode RFL in a compact, single-stage structure operating around 1.5 μm.
- To investigate the use of a scattering-enhanced structure with random-distributed fiber Bragg gratings (RD-FBGs) for improved RFL performance.
Main Methods:
- Fabrication of a scattering-enhanced structure using large-scale random-distributed fiber Bragg gratings (RD-FBGs).
- Implementation of a single-stage, coherent feedback RFL design.
- Characterization of output power, spectral bandwidth, and stability.
Main Results:
- Achieved a maximum output power exceeding 13 W.
- Maintained narrow spectral bandwidths: 3 dB bandwidth of ~0.1 nm and 20 dB bandwidth of ~0.5 nm.
- Demonstrated mitigation of nonlinear accumulation and mode competition through enhanced random feedback.
Conclusions:
- The proposed RD-FBG array offers enhanced scattering efficiency in a compact form factor (~81 m).
- This approach provides a competitive alternative for achieving high-performance random lasing.
- The design effectively balances high power output with spectral stability.
