Centro de Investigaciones en Laseres y Aplicaciones (CEILAP), Instituto de Investigaciones Cientificas y Tecnicaspara la Defensa–Consejo Nacional de Investigaciones Cientificas,J. B. de La Salle 4397, (1603) Villa Martelli, Argentina.
Opt Lett. 2010 Oct 15;35(20):3498-500. doi: 10.1364/OL.35.003498.
We report the experimental and theoretical verification that, in a diode-pumped Nd:YAG+Cr:YAGQ-switched laser, the instabilities in the pulse spacing ("jitter") are ruled by low-dimensional deterministic chaos. From our experimental time series, we determine the embedding and fractal dimensions of the attractor, as well as the values of the Lyapunov exponents. We also present a simplified theoretical description in terms of a map of the same universality class as the logistic map, which explains the bifurcations' cascade and the period-three window of stability observed. The achieved characterization of the dynamics and its main parameters opens a door to effective ways to reduce the jitter, which is of practical interest, through mechanisms of control of chaos. Conversely, the difficulty in the prediction of the interpulse spacing makes this system attractive for high power, robust FM chaotic laser cryptography in free-space propagation.
我们报告实验和理论验证，在二极管泵浦 Nd:YAG+Cr:YAGQ 开关激光器中，脉冲间隔的不稳定性（“抖动”）由低维确定性混沌控制。从我们的实验时间序列中，我们确定了吸引子的嵌入维和分形维，以及李雅普诺夫指数的值。我们还提出了一个简化的理论描述，该描述基于与 logistic 映射相同普遍性类的映射，该映射解释了观察到的分岔级联和稳定的周期三窗口。对动力学及其主要参数的这种特性描述为通过混沌控制机制有效降低抖动（这具有实际意义）开辟了道路。相反，预测脉冲间隔的困难使得这个系统对于在自由空间传播的高功率、鲁棒 FM 混沌激光加密具有吸引力。
