Dynamics of vortex-antivortex pairs and rarefaction pulses in liquid light

Configuration of vortex-antivortex lattices at output mirror of wide-area microchip laser

Square vortex lattices predicted theoretically and experimentally observed in diode-pumped solid state microchip lasers are shown to have a remarkable symmetry. These lattices are formed by counter-rotating vortices. The interaction of vortices with nonlinear gain medium leads to precession of vortices and collective excitations with dynamics identical to acoustical and optical vibrations of atomic lattices.

Self-organized vortex and antivortex patterns in laser arrays

Recently it is shown that dissipatively coupled laser arrays simulate the classical XY model. We show that phase-locking of laser arrays can give rise to the spontaneous formation of vortex and antivortex phase patterns that are analogous to topological defects of the XY model. These patterns are stable although their formation is less likely in comparison to the ground state lasing mode. In addition, we show that small ratios of photon-to-gain lifetime destabilizes vortex and antivortex phase patterns. These findings are important for studying topological effects in optics as well as for desi…

抛物势中光学涡旋-反涡旋耦合波包的异常运动

Abnormal motions of optical vortex-antivortex-coupled wavepackets in the parabolic potential

研究抛物势中光学涡旋-反涡旋耦合波包的异常运动。利用涡旋和反涡旋间固有耦合，通过考虑两种光学波形，理论和实验证明异常运动，揭示多种反直觉传播状态，可调整振荡频率，为相关研究和应用提供机会。

Optical vortex-antivortex crystallization in free space

Stable vortex lattices are basic dynamical patterns which have been demonstrated in physical systems including superconductor physics, Bose-Einstein condensates, hydrodynamics and optics. Vortex-antivortex (VAV) ensembles can be produced, self-organizing into the respective polar lattices. However, these structures are in general highly unstable due to the strong VAV attraction. Here, we demonstrate that multiple optical VAV clusters nested in the propagating coherent field can crystallize into patterns which preserve their lattice structures over distance up to several Rayleigh lengths. To ex…

时空螺旋脉冲中的双螺旋奇点与涡旋-反涡旋湮灭

Double-Helix Singularity and Vortex-Antivortex Annihilation in Space-Time Helical Pulses

本文提出时空螺旋脉冲，其携带双螺旋奇点，传播中保持拓扑不变性，并展现涡旋-反涡旋成对产生与湮灭，有望成为优于传统涡旋光的信息载体。

Simultaneous creation of multiple vortex-antivortex pairs in momentum space in photonic lattices

Engineering of the orbital angular momentum (OAM) of light due to interaction with photonic lattices reveals rich physics and motivates potential applications. We report the experimental creation of regularly-distributed quantized vortex arrays in momentum space by probing the honeycomb and hexagonal photonic lattices with a single focused Gaussian beam. For the honeycomb lattice, the vortices are associated with Dirac points and mimic the Berry curvature sources. However, we show that the resulting spatial patterns of vortices are strongly defined by the symmetry of the wave packet evolving i…