垂直腔激光器中的低频涨落：实验与Lang-Kobayashi动力学
Low frequency fluctuations in a Vertical Cavity Lasers: experiments versus Lang-Kobayashi dynamics
摘要：
分析了Lang-Kobayashi（LK）模型在带光反馈的半导体激光器中的适用范围。模型方程，配备了现实的参数值，研究了孤立激光阈值下，低频起伏（LFF）通常观察到。数值计算结果与实验数据进行了比较，所选择的偏振模式从垂直腔表面激光器（VCSEL）的偏振选择性外反馈。比较揭示的界限内的LK的动态可以被认为是现实的。特别是，它清楚地表明，确定性的LK，为现实的线宽增强因子$α$的值，再现LFF仅作为一个瞬态动力学的静态模式之一，具有最大的增益。仅通过考虑噪声LK或对于极高的$α$值的确定性LK，才能从VCSEL获得真实数据的合理再现。
英文摘要：
The limits of applicability of the Lang-Kobayashi (LK) model for a semiconductor laser with optical feedback are analyzed. The model equations, equipped with realistic values of the parameters, are investigated below solitary laser threshold where Low Frequency Fluctuations (LFF) are usually observed. The numerical findings are compared with experimental data obtained for the selected polarization mode from a Vertical Cavity Surface Laser (VCSEL) subject to polarization selective external feedback. The comparison reveals the bounds within which the dynamics of the LK can be considered as realistic. In particular, it clearly demonstrates that the deterministic LK, for realistic values of the linewidth enhancement factor $α$, reproduces the LFF only as a transient dynamics towards one of the stationary modes with maximal gain. A reasonable reproduction of real data from VCSEL can be obtained only by considering noisy LK or alternatively deterministic LK for extremely high $α$-values.
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