飞秒光纤激光相干合成技术最新进展

Recent progress of coherent combining technology in femtosecond fiber lasers

飞秒光纤激光器具有平均功率高、散热性能佳、光束质量好和空间体积小等优势,在基础研究、工业加工、生物医疗等方面得到越来越广泛的应用.相干合成技术能够有效克服光纤中有害的非线性效应和热效应的影响,进一步提高飞秒光纤激光器输出的脉冲能量和平均功率.本文介绍高功率飞秒光纤激光器相干合成的基本技术路线,重点阐述相干合成技术中关于填充孔径相干合成与平铺孔径相干合成的最新研究进展,并详细介绍相干合成技术中不同类型主动相位锁定技术的基本原理.相信在不远的将来,飞秒光纤激光相干合成系统的单脉冲能量和平均功率将不断攀升,从而开创许多崭新的研究领域.

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 highpower 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.