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arXiv · 2608.06045

Noise-driven pseudovorticity multipoles in self-focusing beams with quintic saturation

Chengbo Zhang·Xiaohui Gao
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Abstract

We investigate pseudovorticity generation in Gaussian beams undergoing self-focusing under amplitude and phase noise, using the cubic-quintic nonlinear Schr\"odinger equation. Pseudovorticity, defined as the curl of the optical momentum flux, characterizes local rotational flow in the absence of phase singularities. Our numerical simulations show that thermal amplitude and phase noise induce a multipolar pseudovorticity pattern. Unlike the pure cubic case, where noise asymmetries are radiated away during collapse, the quintic saturation arrests collapse and traps the noise in the resulting soliton. Hence, pseudovorticity multipoles persist, oscillating at the focusing-refocusing period. These results suggest a potential pathway for controlling local optical torque through noise engineering.

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Chengbo Zhang, Xiaohui Gao. 2026-08-06. Noise-driven pseudovorticity multipoles in self-focusing beams with quintic saturation. https://arxiv.org/abs/2608.06045

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