论文标题

关于贝塞尔样光束的拓扑矢量孤子的产生

On the Generation of Topological Vector Solitons from Bessel-Like Beams

论文作者

Buldt, Finn, Basséne, Pascal, N'Gom, Moussa

论文摘要

光学文献中耦合的孤立波是构成的载体孤子,以反映它们的粒子样性质,即使在相互碰撞之后,它仍然保持完整。它们是由于光强度引起的光学材料的折射率的非线性变化而诞生的。我们已经发现,贝塞尔样梁产生的第二个谐波强度曲线由孤独子组成,这些孤子的各种几何形状被同心环包围。其中之一是两个由椭圆形同心环打结的类似半径的中央孤子。我们观察到它们的几何形状和强度分布取决于入射在非线性培养基上的基本贝塞尔束的拓扑电荷。我们证明它们的空间概况反对传播是不变的。我们观察到它们的行为类似于波列中的螺钉位错的行为:它们从光束传播方向从90美元$^\ circ $角碰撞并反弹。这样,我们已经产生了与不同拓扑的贝塞尔型载体孤子的链接频率,当它们在实验室环境中传播时,它们会在沿光轴振荡时打结。

Coupled solitary waves in optics literature, are coined vector solitons to reflect their particle-like nature that remains intact even after mutual collisions. They are born from a nonlinear change in the refractive index of an optical material induced by the light intensity. We've discovered that the second harmonic intensity profile generated by Bessel-like beams, is composed of solitons of various geometries surrounded by concentric rings; one of which is two central solitons of similar radius knotted by ellipsoidal concentric rings. We observe that their geometry and intensity distribution is dependent on the topological charge of the fundamental Bessel beams incident on the nonlinear medium. We show that their spatial profile is invariant against propagation. We observe that their behavior is similar to that of screw dislocations in wave trains: they collide and rebound at a 90$^\circ$ angle from the beam propagation direction. In this way, we have generated linked frequency doubled Bessel-type vector solitons with different topologies, that are knotted as they oscillate along the optical axis, when propagating in the laboratory environment.

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