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arXiv 2304.09005nlin.PS
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多模波导中三维时空孤子的动力学

Dynamics of three-dimensional spatiotemporal solitons in multimode waveguides

Pedro Parra-Rivas, Yifan Sun, Stefan Wabnitz

AI总结:

本文研究抛物线型多模波导中三维时空孤子的稳定性,结合 Ritz 变分法与数值模拟,揭示自聚焦时高能孤子塌缩及自散焦时高能复杂动力学。

摘要:

在本工作中,我们详细研究了在线性折射率具有抛物线型横向分布的多模波导中出现的基阶时空孤子的动力学与稳定性。这些结构中的脉冲光束传播可通过一个带有二维抛物线型空间势的 Gross–Pitaevskii 方程来描述。我们的研究基于将以 Ritz 优化方法为基础的变分方法与大量数值模拟进行比较。我们发现,在 Kerr 自聚焦非线性条件下,时空孤子在低脉冲能量时是稳定的,此时我们的解析结果与数值模拟完全吻合。然而,能量逐渐增加的孤子最终会发生波塌缩,而这一现象无法在变分框架内预测。在自散焦情形下,低能量时变分预测与模拟同样吻合良好;而对于大孤子能量,则会出现复杂的时空动力学。

英文摘要:

In this work, we present a detailed study of the dynamics and stability of fundamental spatiotemporal solitons emerging in multimode waveguides with a parabolic transverse profile of the linear refractive index. Pulsed beam propagation in these structures can be described by using a Gross-Pitaevskii equation with a two-dimensional parabolic spatial potential. Our investigations are based on comparing variational approaches, based on the Ritz optimization method, with extensive numerical simulations. We found that, with a Kerr self-focusing nonlinearity, spatiotemporal solitons are stable for low pulse energies, where our analytical results find a perfect agreement with the numerical simulations. However, solitons with progressively increasing energies eventually undergo wave collapse, which is not predicted within the variational framework. In a self-defocusing scenario, again for low energies there is good agreement between the variational predictions and simulations. Whereas, for large soliton energies complex spatiotemporal dynamics emerge.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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