Environmentally stable Er-fiber mode-locked pulse generation and amplification by spectrally filtered and phase-biased nonlinear amplifying long-loop mirror  

作　　者：Zhengru Guo Qiang Hao Junsong Peng Heping Zeng 

机构地区：[1]Shanghai Key Laboratory of Modern Optical System,and Engineering Research Center of Optical Instrument and System,Ministry of Education,School of Optical Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China [2]State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China

出　　处：《High Power Laser Science and Engineering》2019年第3期95-101,共7页高功率激光科学与工程（英文版）

基　　金：supported by the National Key Research and Development Program (No. 2018YFB0407100);National Natural Science Foundation of China (Nos. 11434005 and 11621404);Key Project of Shanghai Education Commission (No. 2017-01-07-00-05-E00021)

摘　　要：We report on environmentally stable long-cavity ultrashort erbium-doped fiber lasers,which self-start mode-locking at quite low thresholds by using spectrally filtered and phase-biased nonlinear amplifying long-loop mirrors.By employing 100-m polarization-maintaining fiber(PMF)in the nonlinear loop,the fundamental repetition rate reaches 1.84 MHz and no practical limitation is found to further decrease the repetition rate.The filter used in the long loop not only suppresses Kelly sidebands of the solitons,but also eliminates the amplified spontaneous emission which exists widely in lowrepetition-rate ultrafast fiber lasers.The bandwidth of the filter is optimized by using a numerical model.The laser emits approximately 3-ps pulses with an energy of 17.4 p J,which is further boosted to 1.5μJ by using a fiber amplifier.We report on environmentally stable long-cavity ultrashort erbium-doped fiber lasers, which self-start mode-locking at quite low thresholds by using spectrally filtered and phase-biased nonlinear amplifying long-loop mirrors. By employing 100-m polarization-maintaining fiber(PMF) in the nonlinear loop, the fundamental repetition rate reaches 1.84 MHz and no practical limitation is found to further decrease the repetition rate. The filter used in the long loop not only suppresses Kelly sidebands of the solitons, but also eliminates the amplified spontaneous emission which exists widely in lowrepetition-rate ultrafast fiber lasers. The bandwidth of the filter is optimized by using a numerical model. The laser emits approximately 3-ps pulses with an energy of 17.4 p J, which is further boosted to 1.5 μJ by using a fiber amplifier.

关 键 词：ERBIUM fibers FIBER LASERS FIBER optics AMPLIFIERS and oscillators MODE-LOCKED LASERS 

分 类 号：TN2[电子电信—物理电子学]