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设计并搭建了一种支持百纳焦耳量级的单脉冲能量输出的锁模光纤激光器.激光器基于σ型腔结构,采用掺Yb偏振型大模场面积光子晶体光纤作为增益介质,利用半导体可饱和吸收镜实现自启动锁模.激光器内没有色散补偿机理,使其工作在全正色散锁模状态.通过在谐振腔内引入多通长腔使激光器的重复频率降低至11.1MHz,直接获得了平均功率为1.08W,单脉冲能量为97nJ,脉冲宽度为4.17ps的稳定锁模脉冲输出,经腔外色散补偿,脉冲宽度压缩至740fs。
A mode-locked fiber laser is designed and built to support the single-pulse energy output in the order of one hundred joules.Laser is based on sigma-type cavity structure and adopts Yb-polarization mode-area photonic crystal fiber with Yb polarization as the gain medium, The absorption mirror realizes the self-starting mode-locking. There is no dispersion compensation mechanism in the laser, which makes it work in all positive dispersion mode-locked state. The average repetition frequency of the laser is reduced to 11.1MHz by introducing multi-pass long cavity in the resonator, Power of 1.08W, a single pulse energy of 97nJ, a pulse width of 4.17ps stable mode-locked pulse output, the dispersion compensation through the extra-aura, the pulse width is compressed to 740fs.