Semiconductor mode-locked laser with external feedback: emergence of multi-frequency pulse trains with an increasing number of modes
Semiconductor mode-locked laser with external feedback: emergence of multi-frequency pulse trains with an increasing number of modes
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DOI：
10.1140/epjb/e2019-90662-4
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发表时间：
2019-04-01
影响因子：
1.6
通讯作者：
Krauskopf, Bernd
中科院分区：
文献类型：
--
作者：
Ludge, Kathy;Jaurigue, Lina;Krauskopf, Bernd
我们研究了一种具有光反馈和光谱滤波器的锁模激光器，该滤波器限制了激光模式的数量。对于多达约10个模式，激光器有效地表现为单模激光器：它可以产生Q开关脉冲，但不锁模。当模式的数量增加时，我们观察到与不变环面和多稳态相关联的多频脉冲的出现。我们模拟这个系统的延迟微分方程系统的电场，增益和吸收，并提出了分叉分析的路线，这种类型的脉冲。为了增加光谱滤波器的宽度，我们提出了在平面上的延迟时间和强度的外部反馈回路的分岔图。相关的动态表示通过二维周期往返图和二维谱图。我们照亮了不同的环面和相应的频率上的动态的出现。
We investigate a mode-locked laser with optical feedback and a spectral filter that limits the number of lasing modes. For up to around ten modes the laser effectively behaves as a single-mode laser: it may generate Q-switched pulses but does not mode lock. When the number of modes is increased we observe the emergence of multi-frequency pulsing associated with invariant tori and multistability. We model this system with a delay differential equation system for the electric field, the gain and the absorption, and present a bifurcation analysis of the route to this type of pulsing. For increasing spectral filter width we present bifurcation diagrams in the plane of delay time and strength of the external feedback loop. The associated dynamics are represented by means of 2D period-roundtrip diagrams and 2D spectral plots. We illuminate the emergence of dynamics on different tori and the corresponding frequencies involved.