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Coherent beam combination of 1.08 kW fiber amplifier array using single frequency dithering technique
Yanxing Ma1, Xiaolin Wang, Jinyong Leng
1College of Opticelectric Science and Engineering, National University of Defense Technology, Changsha, China.
Optics Letters
|March 16, 2011
Summary
This study demonstrates the first coherent beam combination of a 1.08 kW fiber amplifier array. A novel phase control system achieved over 85% fringe contrast, paving the way for high-power fiber lasers.
Area of Science:
- Optics and Photonics
- Laser Physics
- Fiber Optics
Background:
- High-power fiber lasers are crucial for various applications.
- Achieving coherent beam combination from multiple fiber amplifiers presents significant challenges.
- Previous methods have limitations in scalability and efficiency.
Purpose of the Study:
- To demonstrate the first coherent beam combination of a 1.08 kW fiber amplifier array.
- To develop and implement an effective phase control system for fiber amplifier arrays.
- To improve the beam quality and power scalability of fiber laser systems.
Main Methods:
- A 3x3 array of nine fiber amplifiers, each delivering approximately 120 W, was utilized.
- A single frequency dithering algorithm was employed for phase noise compensation.
- A field-programmable gate array (FPGA) based signal processor was used for real-time phase control.
Main Results:
- Successful coherent beam combination of a 1.08 kW fiber amplifier array was achieved.
- The phase control system improved fringe contrast in the far-field intensity pattern to over 85%.
- Residual phase error was reduced to less than λ/15, indicating high coherence.
Conclusions:
- Coherent beam combination of high-power fiber amplifier arrays is feasible.
- The implemented phase control algorithm and FPGA system are effective for achieving high beam quality.
- This work advances the development of scalable, high-power fiber laser sources.
