Harmonic mode locking of bound solitons.
Harmonic mode locking of bound solitons.
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DOI：
10.1364/ol.40.001065
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发表时间：
2015-03
期刊：
影响因子：
3.6
通讯作者：
Zhiqiang Wang;L. Zhan;Asif Majeed;Zhi Zou
中科院分区：
文献类型：
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作者：
Zhiqiang Wang;L. Zhan;Asif Majeed;Zhi Zou
系统地研究了非线性偏振旋转（NPR）锁模后光纤激光器中两个孤子束缚态的被动谐波锁模（HML）。实验结果表明，在一定的离散间距下，束缚孤子可以达到稳定的HML态。通过增加泵浦功率和稍微改变腔内的偏振态来改变重复率。动态类似于单脉冲操作的HML。在实验中，当泵浦功率从168 mW增加到476.1 mW时，重复频率可以从基模锁定上升到九阶HML。一旦获得BS，它们的间隔固定在1.5 ps，而不管HML阶数。在直接BS相互作用下，BS序列非常稳定且易于重现。这种半模似然的行为证实了半模似然是激光器除单孤子外的另一个本征特征。
We systematically investigate the passive harmonic mode locking (HML) of the bound states of two solitons in a fiber laser that has been mode locked by nonlinear polarization rotation (NPR). The experiment shows that the stable HML state of the bound solitons (BSs) with a fixed and discrete separation is obtained. The repetition rate changes by increasing the pump power and slightly altering the polarization state in the cavity. The dynamic is similar to the HML of a single-pulse operation. In our experiment, the repetition rate can be turned from the fundamental mode locking up to ninth-order HML when the pump power is increased from 168 to 476.1 mW. Once the BSs are obtained, their separation is fixed at 1.5 ps, regardless of the HML order. Under the direct BS interaction, the BS trains are very stable and easily reproducible. This HML behavior of BSs confirms that the BS is another intrinsic feature of the laser, except for the single soliton.