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Self-imaging-based high-power all-fiber coherent combiners: fabrication and preliminary demonstration
Optics Letters
|March 22, 2023
Summary
Researchers fabricated novel self-imaging combiners for all-fiber coherent beam combination. This method achieved 52.7% combining efficiency, demonstrating a new approach for high-power fiber lasers.
Area of Science:
- Optics and Photonics
- Fiber Optics Engineering
Background:
- Coherent beam combination (CBC) is crucial for high-power fiber lasers.
- Achieving filled-aperture CBC in an all-fiber format presents significant challenges.
Purpose of the Study:
- To fabricate and demonstrate self-imaging combiners for all-fiber CBC.
- To investigate the performance of different fiber types in a self-imaging CBC system.
Main Methods:
- Fabrication of 2x2 self-imaging combiners using large-mode-area fibers, glass tubes, and square-core fibers.
- Testing of combiners made with polarization-maintaining and non-polarization-maintaining fibers.
- Evaluation of combining efficiency in an all-fiber CBC system.
Main Results:
- Successful fabrication of two types of self-imaging combiners.
- Non-polarization-maintaining fibers demonstrated superior positioning precision.
- A maximal combining efficiency of 52.7% was achieved.
Conclusions:
- This study presents the first validation of all-fiber CBC utilizing the self-imaging effect.
- Fabrication precision and fiber geometry are critical for optimizing combining efficiency.
- Further improvements are possible with refined fabrication processes and specialized square-core fibers.
