Nonlinear propagation dynamics of finite-energy Airy beams
Nonlinear propagation dynamics of finite-energy Airy beams
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DOI：
10.1103/physreva.86.013842
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发表时间：
2012-07-27
影响因子：
2.9
通讯作者：
Tzortzakis, S.
中科院分区：
文献类型：
--
作者：
Panagiotopoulos, P.;Abdollahpour, D.;Tzortzakis, S.
从数值模拟和实验两方面研究了强截断艾里光束在克尔电离介质中的非线性动力学。数值计算表明，线性效应和非线性效应之间存在竞争，可以通过调节艾里光束主瓣的宽度和截断光圈的大小来改变这种竞争。我们的分析表明，作为线性艾利光束传输的固有特征，艾里峰的加速度只在主艾里瓣的功率低于一定阈值时保持不变。低功率强流艾里光束在主瓣中的非线性传输是由相邻光束的连续能量流维持的，类似于贝塞尔光束的非线性传输机制。在克尔和多光子非线性的作用下，主瓣中功率较高的气体光束被重塑成多丝图案。新细丝的成核及其相互作用影响主艾利叶的加速。最后，我们证明了截断的大小构成了表征艾里束加速的能量流的控制参数。在水中进行的实验证实了这两种不同的非线性传播模式的存在。
The nonlinear dynamics of intense truncated Airy beams in Kerr ionizing media are investigated from numerical simulations and experiments. We show numerically that a competition between the linear and nonlinear effects takes place and may be modified by tuning the width of the main lobe of the Airy beam and the size of the truncating diaphragm. Our analysis shows that the acceleration of the Airy peak, an inherent feature of linear Airy beam propagation, is preserved only for powers in the main Airy lobe below a certain threshold. Nonlinear propagation of intense Airy beams with low power in the main lobe is sustained by a continuous energy flux from its neighbors, similarly to the mechanism sustaining nonlinear Bessel beam propagation. Airy beams with higher powers in the main lobe are reshaped into a multifilamentary pattern induced by Kerr and multiphoton nonlinearities. The nucleation of new filaments and their interaction affect the acceleration of the main Airy lobes. We finally show that the size of the truncation constitutes a control parameter for the energy flux that features the Airy beam acceleration. Experiments performed in water corroborate the existence of these two distinct nonlinear propagation regimes.