摘要
A high pulse energy femtosecond fiber laser based on a large-mode-area photonic crystal fiber is demonstrated. A segment of Yb-doped single-polarization large-mode-area photonic crystal fiber with extremely low nonlinearity is explored as gain media of this fiber laser, resulting in intrinsically environmentally stability. The fiber laser is based on a linear cavity with dispersion compensation free configuration, and the stable mode-locking is obtained by a semiconductor saturable absorber mirror (SESAM). The fiber laser directly generates 2.5 W of average power at a repetition rate of 51.4 MHz, corresponding to a single pulse energy of 50 nJ. The output pulse duration is 4.2 ps, which is dechirped to 410 fs after extracavity dispersion compensation. The nonlinear absorption of SESAM determines the pulse shaping at low output power, while the mode-locking mechanism is under the balance between spectrum broadening from self-phase-modulation and gain filtering at the high output power.
A high pulse energy femtosecond fiber laser based on a large-mode-area photonic crystal fiber is demonstrated. A segment of Yb-doped single-polarization large-mode-area photonic crystal fiber with extremely low nonlinearity is explored as gain media of this fiber laser, resulting in intrinsically envi- ronmentally stability. The fiber laser is based on a linear cavity with dispersion compensation free con- figuration, and the stable mode-locking is obtained by a semiconductor saturable absorber mirror （SESAM）. The fiber laser directly generates 2.5 W of average power at a repetition rate of 51.4 MHz, corresponding to a single pulse energy of 50 nJ. The output pulse duration is 4.2 ps, which is dechirped to 410 fs after extracavity dispersion compensation. The nonlinear absorption of SESAM determines the pulse shaping at low output power, while the mode-locking mechanism is under the balance between spectrum broadening from self-phase-modulation and gain filtering at the high output power.
基金
the State Key Development Program for Basic Research of China (Grant Nos. 2003CB314904, 2006CB806002)
the National High Technology Research and Development Program of China (Grant No. 2007AA03Z447)
the National Natural Science Foundation of China (Grant No. 60678012)
the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant Nos. 20070056083, 20070056073)
the Key Project of Chinese Ministry of Education.(Grant No 108032)
the Program for New Century Excellent Talents in University of Ministry of Education, China (Grant No. NCET-07-0597)
关键词
光晶体纤维
光纤激光器
脉冲能耗
大模式纤维
femtosecond, photonic crystal fiber, large-mode-area fiber, fiber laser
