产生随机数的自发混沌微激光器
Spontaneous Chaotic Microlasers for Random Number Generation
摘要：
混沌半导体激光器由于其相对于由计算过程产生的伪随机数具有不可预测性的优点而被广泛研究，特别是对于具有外部光反馈的激光器。本文报道了第一个由近简并模相互作用产生的自发混沌微激光。设计并实现了具有可调模式间隔的圆边六边形微激光器，其基模和一阶横模的模式间隔为GHz量级。四个模式，包括退化模式与强模式拍将导致混沌。从高维数为5.46的激光输出功率中获得了10 Gb/s的真随机数。这一发现为实现高速随机数产生提供了一种新的、简单的方法，为研究孤立激光器中的非线性动力学行为奠定了基础。
英文摘要：
Chaotic semiconductor lasers have been widely investigated for generating true random numbers with the merit of unpredictability relative to pseudorandom numbers generated by a computing process, especially for the lasers with external optical feedback. Here, we report the first spontaneous chaotic microlaser due to the interaction of nearly degenerate modes. The circular-side hexagonal microlaser is designed and demonstrated with adjusted mode intervals in the order of GHz for the fundamental and the first order transverse modes. Four modes including degenerate modes with strong mode beating will result in chaos. True random numbers at 10Gb/s is obtained from the laser output power with a high dimension of 5.46. Our finding provides a novel and easy way to create controllable and robust optical chaos for high speed random number generation, which also paves the way for the nonlinear dynamics in a solitary laser.
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