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Abstract

Widely employed in fundamental research, industrial processing, and biomedicine, femtosecond fiber lasers exhibit many attractive features such as high average power, good heat dissipation, excellent beam quality, and compact footprint. Coherent combining technology can effectively suppress the detrimental nonlinear and thermal effects in the fiber amplifiers, and therefore further increase the output pulse energy and average power of femtosecond fiber lasers. In this article, we mainly discuss different coherent combining techniques in high-power ultrafast Yb-fiber laser systems and the relevant phase-locking methods. We believe that the advent of new coherent combining techniques will further improve the average power and pulse energy of femtosecond fiber laser systems, thereby opening up some new research areas.

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Authors and contacts

Corresponding author:Chang Guo-Qing,guoqing.chang@iphy.ac.cn

Funds:Project supported by the Key-Area R&D Program of Guangdong Province, China (Grant No. 2018B090904003), the National Natural Science Foundation of China (Grant Nos. 11774234, 91850209), and the Program of Development of a New Multiphoton Microscope for Large Depth and High Precision Imaging of Three-dimensional Biological Models, China (Grant No. YJKYYQ20190034).

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Cited By

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技术名称	子类	截至目前最佳参数	特点
填充孔径	空间合成	P= 10.4 kW;E= 0.13 mJ;η= 96%^[21]	有效提高系统的平均功率
	时间合成	—	有效提高脉冲能量
	多维度相干合成	P= 674 W;E= 23 mJ;η= 71%^[20]	同时提高脉冲能量与平均功率
	多芯合成	P= 205 W;E= 20.5 μJ;η= 80%^[41]	减少空间体积, 简化实验装置
平铺孔径		P= 1.5 kW;E= 750 μJ;η= 48%^[45]	合成效率低, 但合成通道数潜力巨大

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Vol. 70, Issue 3 - 2021-02-05

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