Research progress and prospect of high power all-fiber coherent beam combination based on fiber combining devices
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摘要: 介绍了目前研究中相干合成多采用空间结构的研究现状，分析了空间结构的相干合成方案需要复杂的光路调节且长时间工作稳定性欠缺，肯定了基于光纤合束器件的全光纤激光相干合成在相干合成光源中的稳定性与实用性，梳理了近年来基于光纤合束器件的全光纤激光相干合成方案，分别介绍了基于光纤耦合器、光子灯笼、相干信号合束器以及基于自成像效应实现全光纤合束的技术方案及研究现状，分析了不同光纤器件目前的主要限制因素和发展瓶颈，并展望了未来的发展方向。Abstract: The output power of high-power single fiber laser is limited by various physical effects, and it is difficult to achieve a breakthrough in the short term. Coherent beam combination (CBC) of fiber lasers is an effective technical solution to break the power limit of single fiber laser and achieve higher output power. This paper introduces the status quo of CBC research, which mostly uses free-space structure. It is analyzed that the CBC scheme of spatial structure requires complex optical adjustment, and suffers the problem of long-term drifting. The all-fiber coherent beam combination based on all-fiber combining device can enhance the stability and practicability of the combining laser source, and the recent development of CBC in all-fiber format is reviewed in detail. The combining schemes and research status based on fiber coupler, photon lantern, coherent signal combining device and all-fiber device of self-imaging effect are introduced respectively. The main limiting factors and development bottlenecks of different fiber devices are discussed, and the future development prospects are analyzed.
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Key words:
- coherent beam combination /
- high power fiber laser /
- all-fiber /
- beam quality
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图 1 全纤化相干合成系统示意图
Figure 1. Schematic diagram of the all-fiber coherent beam combination system
图 3 基于光纤偏振合束器的两路相干合成实验结构示意图
Figure 3. Schematic diagram of two-channel CBC based on fiber polarization beam combiner
图 4 光子灯笼结构及传统灯笼结构示意图
Figure 4. Diagram of the structure of photonic lantern and traditional lantern
图 6 3×1 光子灯笼相干合成实验结构示意图
Figure 6. Schematic diagram of 3×1 photonic lantern coherent combining
图 7 千瓦级光子灯笼实验结构示意图及结果
Figure 7. Diagram of the structure and the results of kW photonic lantern system
图 8 61路光子灯笼结构和截面示意图
Figure 8. Structure and section diagram of 61-core photonic lantern
图 9 3×1光子灯笼实验结构示意图及结果
Figure 9. Experimental structure diagram and results of 3×1 photonic lantern
图 10 基于拉锥技术的相干信号合束器结构示意图
Figure 10. Schematic diagram of the structure of the coherent signal beam combiner based on taper technology
图 11 相干信号合束器实验原理示意图及实验前后光斑图
Figure 11. Diagram of the experiment of coherent signal beam combiner and light spots before and after experiment
图 12 16 kW相干合成激光实验系统及结果示意图
Figure 12. Diagram of the 16 kW coherent beam combination system and the results
图 13 两路Y形相干合束实验结构示意图
Figure 13. Schematic diagram of the experimental structure of the two-channel Y-shaped coherent beam combination
图 14 4路合束器合束结构示意图
Figure 14. Schematic diagram of the beam combining structure of the 4-way beam combiner
图 15 基于自成像效应的空间结构相干合成模块
Figure 15. Photograph of the free-space beam combiner module based on self-imaging effect
图 17 2×2非相干信号合束器结构示意图和实验结果
Figure 17. Diagram of structure and results of 2×2 incoherent signal combiner
图 19 不同光纤阵列下，合束效果随方形光纤数值孔径变化示意图
Figure 19. Diagram of the function of the combining effects of NA with different fiber arrays
图 20 方形光纤自成像效应理论和实验验证结果
Figure 20. Theoretical and experimental verification results of square fiber self-imaging effect
图 21 基于方形光纤的光纤合束器结构示意图、输入光斑和合成结果
Figure 21. Diagram of the beam combiner based on the square fiber， the input spots and combining result
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