Influence of carrier lifetimes on the dynamical behavior of quantum-dot lasers subject to optical feedback.
Influence of carrier lifetimes on the dynamical behavior of quantum-dot lasers subject to optical feedback.
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DOI：
10.1103/physreve.86.046201
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
B. Globisch;C. Otto;E. Schöll;K. Lüdge
中科院分区：
文献类型：
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作者：
B. Globisch;C. Otto;E. Schöll;K. Lüdge
我们研究了半导体量子点（QD）激光器在光反馈作用下的动力学变化，这些变化与QD激光器能带结构的变化相关。通过采用量子点和载流子库之间的载流子-载流子散射过程的微观模型，我们能够调节量子点中的载流子寿命，例如，通过修改QD限制能量或泵浦电流。通过使用数值延拓方法以及渐近理论，我们证明了反馈灵敏度至关重要地取决于这些寿命通过阻尼的开启振荡，和小的寿命的顺序，这个弛豫时间尺度导致增加的反馈电阻率。因此，智能能带结构工程可以导致激光器在大的参数范围内稳定的连续波操作。
We examine changes in the dynamics of a semiconductor quantum-dot (QD) laser subject to optical feedback that correlate to changes in the QD laser band structure. By employing a microscopic model for the carrier-carrier scattering processes between the QDs and the carrier reservoir we are able to tune the carrier lifetimes in the QDs, e.g., by modifying the QD confinement energies or the pump current. By using numerical continuation methods as well as asymptotic theory we demonstrate that the feedback sensitivity crucially depends on these lifetimes through the damping of the turn-on oscillations, and small lifetimes on the order of this relaxation time scale lead to an increased feedback resistivity. Thus intelligent band structure engineering can lead to stable continuous wave operation of the laser over a large parameter range.