被动锁模Yb3+光纤环形腔激光器的研究

 采用974 nm半导体激光器作为泵浦源，超高掺杂Yb³⁺光纤作为增益介质，利用光纤的非线性偏振旋转效应，得到稳定的ps量级锁模光脉冲。泵浦功率220 mW时，激光器锁模阈值功率150 mW，输出功率26 mW，锁模光脉冲中心波长1 046 nm，3 dB带宽6.01 nm，20 dB带宽16 nm，脉宽22 ps，重复频率20 MHz。与同类光纤激光器相比，该激光器输出功率高，具有更好的稳定性。

Passive mode-locked Yb3+-doped fiber ring laser

Using ultra-highly doped Yb~(3 )fiber as gain medium for the first time in China,pumped by 974 nm LD and passively mode-locked by nonlinear polarization rotation effect of the fiber,stable mode-locked fiber ring laser is obtained.The mode-locked threshold power of the laser is 150 mW and the output power is 26 mW with a pump power of 220 mW.The center wavelength of the mode-locked pulse is 1 046 nm with 3 dB bandwidth of 6.01 nm,20 dB bandwidth of 16nm,pulsewidth of 22 ps and repetition rate of 20 MHz.Compared with similar fiber lasers,the laser has higher output power and better stability.