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报道了一种长腔掺镱锁模光纤激光器。除用以实现自启动锁模的非线性偏振旋转(NPR)元件外,激光器为全单模光纤结构,且腔内无色散补偿元件,工作在全正色散域,仅仅通过引入窄带滤波器参与脉冲整形过程输出耗散孤子。实验中通过延长单模光纤长度实现了两个长腔条件,分别得到了6.66 MHz重复频率,12 nJ单脉冲能量和5.05 MHz重复频率,20 nJ单脉冲能量的稳定锁模脉冲,噪声抑制比均为75 dB。与以往的全正色散锁模光纤激光器相比,重复频率低,单脉冲能量高,稳定性好,适用于构建简化的光纤啁啾脉冲放大(CPA)系统。
A long-cavity ytterbium-doped mode-locked fiber laser is reported. In addition to non-linear polarization rotation (NPR) elements for self-starting mode-locking, the laser is a full single-mode fiber structure with no dispersion compensating elements in the cavity and operates in a fully positive dispersion domain only by introducing a narrow-band filter in the pulse The shaping process outputs dissipative solitons. In the experiment, two long-cavity conditions were achieved by extending the length of the single-mode optical fiber. The stable mode-locked pulses of 6.66 MHz repetition frequency, 12 nJ single pulse energy and 5.05 MHz repetition frequency, 20 nJ single-pulse energy, 75 dB. Compared with the previous all-positive dispersion mode-locked fiber laser, it has the advantages of low repetition frequency, high single-pulse energy and good stability, and is suitable for constructing a simplified fiber-optic chirped pulse amplification (CPA) system.