Excitable interplay between lasing quantum dot states
Excitable interplay between lasing quantum dot states
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DOI：
10.1103/physreve.100.012202
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发表时间：
2019-07-17
影响因子：
2.4
通讯作者：
Viktorov, E. A.
中科院分区：
文献类型：
--
作者：
Dillane, M.;Dubinkin, I;Viktorov, E. A.
光学注入半导体激光系统已被证明是一个很好的实验非线性动力学来源，特别是在产生可激发脉冲方面。通常情况下，对于低注入强度，这些脉冲是稳定稳态的阈值以上小扰动的结果，基本物理由Adler相位方程很好地描述，并且每个激光强度脉冲伴随着2pi的相位旋转。在这篇文章中，我们展示了如何利用双态量子点激光器，一种不能用阿德勒模型描述的第一类激发度的变化是可能的。激光器的工作方式是仅从激发态发射。在激发态被完全抑制的同时，可以通过光注入激活基态并锁相到主激光器。在锁相边界附近，可以观察到与激发态脉冲相关的基态发射损耗区域。我们发现，由于与激发态的相互作用，基态的相位经历了有界旋转。我们从实验和数值两方面对该系统进行了分析，得到了很好的一致性。特别关注了可激发脉冲所需的分叉条件以及它的时间演化。
The optically injected semiconductor laser system has proven to be an excellent source of experimental nonlinear dynamics, particularly regarding the generation of excitable pulses. Typically for low-injection strengths, these pulses are the result of a small above-threshold perturbation of a stable steady state, the underlying physics is well described by the Adler phase equation, and each laser intensity pulse is accompanied by a 2 pi phase rotation. In this article, we show how, with a dual-state quantum dot laser, a variation of type I excitability is possible that cannot be described by the Adler model. The laser is operated so that emission is from the excited state only. The ground state can be activated and phase locked to the master laser via optical injection while the excited state is completely suppressed. Close to the phase-locking boundary, a region of ground-state emission dropouts correlated to excited-state pulses can be observed. We show that the phase of the ground state undergoes bounded rotations due to interactions with the excited state. We analyze the system both experimentally and numerically and find excellent agreement. Particular attention is devoted to the bifurcation conditions needed for an excitable pulse as well as its time evolution.