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波长可调谐的锁模柱矢量光纤激光器

Wavelength-tunable mode-locked cylindrical vector beam fiber laser

  • 摘要: 为了在光纤激光器中获得具有中心波长可调谐的锁模脉冲柱矢量,采用半导体可饱和吸收镜和高反的啁啾光纤光栅作为腔镜,搭建了直腔掺镱脉冲光纤激光器,腔内插入长周期光纤光栅作为模式转化器件,进行了实验验证,取得了波长可调谐的柱矢量脉冲数据。结果表明,激光器工作在1060.72 nm时,光谱带宽0.22 nm,输出斜率效率为8.6%,锁模脉冲宽度为10.9 ps,重频18.66 MHz,锁模脉冲信噪比高达65 dB,同时获得了模式纯度超过97%的柱矢量光束;调节腔内的偏振控制器来改变腔内波长的损耗,可以实现锁模柱矢量脉冲的谐振波长在1060.72 nm~1066.04 nm连续可调。该研究为可调谐脉冲柱矢量光纤激光器研制提供了重要的参考价值。

     

    Abstract: To obtain wavelength-tunable pulse cylindrical vector beam, a linear cavity mode-locked doped-Yb fiber laser was experimentally constructed by using a chirped fiber grating and a semiconductor saturable absorption mirror. A long-period fiber grating was inserted into the cavity to serve as mode conversion device. The results show that when the mode-locked fiber laser operates at 1060.72 nm, the spectral width, slope efficiency, pulse width, fundamental repetition frequency, signal-to-noise ratio, and the cylindrical vector beam mode purity is 0.22 nm, 8.6%, of 10.9 ps, 18.66 MHz, 65 dB, >97%, respectively. Besides, the operating wavelength of the mode-locked fiber laser can be continuously tuned from 1060.72 nm to 1066.04 nm due to the changing of the cavity loss by adjusting the polarization controller. This study may provide an important reference for the development of wavelength-tunable pulsed cylindrical vector beam fiber laser.

     

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