Guo Yanqiang, Peng Chunsheng, Ji Yulin, Li Pu, Guo Yuanyuan, Guo Xiaomin
Opt Express. 2018 Mar 5;26(5):5991-6000. doi: 10.1364/OE.26.005991.
The photon statistics and bunching of a semiconductor laser with external optical feedback are investigated experimentally and theoretically. In a chaotic regime, the photon number distribution is measured and undergoes a transition from Bose-Einstein distribution to Poisson distribution with increasing the mean photon number. The second order degree of coherence decreases gradually from 2 to 1. Based on Hanbury Brown-Twiss scheme, pronounced photon bunching is observed experimentally for various injection currents and feedback strengths, which indicates the randomness of the associated emission light. Near-threshold injection currents and strong feedback strengths modify exactly the laser performance to be more bunched. The macroscopic chaotic dynamics is confirmed simultaneously by high-speed analog detection. The theoretical results qualitatively agree with the experimental results. It is potentially useful to extract randomness and achieve desired entropy source for random number generator and imaging science by quantifying the control parameters.
对具有外部光反馈的半导体激光器的光子统计和聚束现象进行了实验和理论研究。在混沌状态下，测量了光子数分布，并且随着平均光子数的增加，光子数分布经历了从玻色 - 爱因斯坦分布到泊松分布的转变。二阶相干度从2逐渐降低到1。基于汉伯里·布朗 - 特威斯方案，在各种注入电流和反馈强度下，通过实验观察到明显的光子聚束现象，这表明相关发射光的随机性。接近阈值的注入电流和强反馈强度会精确地改变激光性能，使其更具聚束性。通过高速模拟检测同时证实了宏观混沌动力学。理论结果与实验结果定性相符。通过量化控制参数，对于提取随机性并为随机数发生器和成像科学实现所需的熵源可能是有用的。
