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arXiv 1704.03328nlin.PSphysics.optics
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二维Lugiato-Lefever方程的零维极限

Zero-dimensional limit of the two-dimensional Lugiato-Lefever equation

Wesley B. Cardoso, Luca Salasnich, Boris A. Malomed

摘要:

通过求解二维Lugiato-Lefever(2D LL)方程,考虑自聚焦或散焦非线性、损耗、泵浦和俘获势,研究了紧谐振子约束对激光腔内电磁场的影响。紧限制(准零维)的光学模式(像素),由这个模型产生的,分析通过变分近似,它提供了一个定性的图片随后的现象。其次是系统的模拟的时间相关的二维LL方程,这揭示了形状,稳定性和动力学行为所产生的本地化模式。通过这种方式,我们为预期的像素生成稳定性图。然后,我们考虑了具有涡泵的LL模型,表明它可以在非常宽的稳定区域内产生具有嵌入涡量的稳定像元(涡孤子)。在后一种情况下,除了具有简单单环结构的受限涡旋外,LL模型还产生了具有螺旋相场的稳定多环态。除数值结果外,利用高斯-费米近似对涡旋孤子作了定性正确的描述。

英文摘要:

We study effects of tight harmonic-oscillator confinement on the electromagnetic field in a laser cavity by solving the two-dimensional Lugiato-Lefever (2D LL) equation, taking into account self- focusing or defocusing nonlinearity, losses, pump, and the trapping potential. Tightly confined (quasi-zero-dimensional) optical modes (pixels), produced by this model, are analyzed by means of the variational approximation, which provides a qualitative picture of the ensuing phenomena. This is followed by systematic simulations of the time-dependent 2D LL equation, which reveal the shape, stability, and dynamical behavior of the resulting localized patterns. In this way, we produce stability diagrams for the expected pixels. Then, we consider the LL model with the vortical pump, showing that it can produce stable pixels with embedded vorticity (vortex solitons) in remarkably broad sta- bility areas. Alongside confined vortices with the simple single-ring structure, in the latter case the LL model gives rise to stable multi-ring states, with a spiral phase field. In addition to the numeri- cal results, a qualitatively correct description of the vortex solitons is provided by the Thomas-Fermi approximation.

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