Nonlinear emission characteristics of quantum dot–micropillar lasers in the presence of polarized optical feedback
Nonlinear emission characteristics of quantum dot–micropillar lasers in the presence of polarized optical feedback
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DOI：
10.1088/1367-2630/15/2/025030
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发表时间：
2013-02
影响因子：
3.3
通讯作者：
C. Hopfmann;F. Albert;Schneider;S. Höfling;M. Kamp;A. Forchel;I. Kanter;S. Reitzenstein
中科院分区：
文献类型：
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作者：
C. Hopfmann;F. Albert;Schneider;S. Höfling;M. Kamp;A. Forchel;I. Kanter;S. Reitzenstein
本文报道了在偏振自反馈作用下的电泵浦量子点微激光器。高β微激光器显示出两个正交的线偏振发射模式，它们通过共同的增益介质耦合。这种耦合的两个激射模式之间的增益竞争方面的解释，并导致其输入输出特性的明显差异。通过应用偏振自反馈通过外部镜，我们能够控制的激光特性的发射模式的输出功率，相干时间和光子统计。我们发现，线偏振自反馈稳定了一个给定模式的激射，而两个模式之间的交叉偏振反馈强烈地降低了另一个发射模式的强度，显示出特定的高强度波动，甚至在零延迟处光子自相关函数g（2）（τ）的超热值。在外部反馈下对g（2）（τ）的测量还允许我们检测与外部腔的往返时间相关联的复兴峰。通过唯象模型分析g（2）（τ）回复峰的阻尼和形状，为我们提供了深入了解这些微激光器有源区量子点的有效激子寿命和增益特性等基本物理机制的机会。
We report on electrically pumped quantum dot–microlasers in the presence of polarized self-feedback. The high-β microlasers show two orthogonal, linearly polarized emission modes which are coupled via the common gain medium. This coupling is explained in terms of gain competition between the two lasing modes and leads to distinct differences in their input–output characteristics. By applying polarized self-feedback via an external mirror, we are able to control the laser characteristics of the emission modes in terms of the output power, the coherence time and the photon statistics. We find that linearly polarized self-feedback stabilizes the lasing of a given mode, while cross-polarized feedback between the two modes reduces strongly the intensity of the other emission mode showing particular high-intensity fluctuations and even super-thermal values of the photon autocorrelation function g(2)(τ) at zero delay. Measurements of g(2)(τ) under external feedback also allow us to detect revival peaks associated with the round trip time of the external cavity. Analyzing the damping and shape of the g(2)(τ) revival peaks by a phenomenological model provides us insight into the underlying physics such as the effective exciton lifetime and gain characteristics of the quantum dots in the active region of these microlasers.