Complex dynamics of a fiber laser in non-stationary pulsed operation.
Complex dynamics of a fiber laser in non-stationary pulsed operation.
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DOI：
10.1364/oe.24.018917
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发表时间：
2016-08
期刊：
影响因子：
3.8
通讯作者：
E. Garcia-Sanchez;O. Pottiez;Y. Bracamontes-Rodríguez;J. P. Lauterio-Cruz;H. E. Ibarra-Villalon;J. Hernánde
中科院分区：
文献类型：
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作者：
E. Garcia-Sanchez;O. Pottiez;Y. Bracamontes-Rodríguez;J. P. Lauterio-Cruz;H. E. Ibarra-Villalon;J. Hernánde
传统的锁模的特征在于产生稳定的光脉冲串。即使在光纤激光器的类噪声脉冲状态下，有时被描述为部分锁模，仍然会产生周期性的波形串。在这项工作中，我们研究了远离稳定的类噪声脉冲状态的8字形光纤激光器的动力学。通过分析序列的时域测量与ns的分辨率进行，我们揭示了一个广泛的令人费解的动态，其中子结构出现和漂移远离主束，衰减或生长在一个阶梯状的方式，突然消失之前。在某些情况下，子数据包也集中在周期的中心部分，形成一个或多个宽云，在秒或分钟的时间尺度上合并或分裂。这些多个状态之间的自发跃迁以非周期性的方式发生，因此在长时间尺度上没有发现准稳态行为。这些结果提供了一个非常丰富的动态发生在光纤激光器的前沿锁模的戏剧性的说明。
Conventional mode locking is characterized by the generation of a stable train of optical pulses. Even in the noise-like pulsing regime of fiber lasers, sometimes described as partial mode locking, a periodic train of waveforms is still generated. In this work we study the dynamics of a figure-eight fiber laser away from the stable noise-like pulsing regime. By analyzing sequences of time-domain measurements performed with ns resolution, we reveal a wide range of puzzling dynamics, in which sub-structures emerge and drift away from the main bunch, decay or grow in a step-like manner, before vanishing abruptly. In some cases, sub-packets also concentrate in the central part of the period, forming one or multiple wide clouds that merge or split over time scales of seconds or minutes. Spontaneous transitions between these multiple states occur in a non-periodic manner, so that no quasi-stationary behavior is found over long time scales. These results provide a dramatic illustration of the extremely rich dynamics taking place in fiber lasers at the frontier of mode locking.