Laboratoire d'Optique Appliquée - ENSTA ParisTech, Ecole Polytechnique, CNRS-828 boulevard des Maréchaux, 91762 Palaiseau Cedex, France.
Centre de Physique Théorique - Ecole Polytechnique, CNRS-1 route de Saclay, 91128 Palaiseau Cedex, France.
Phys Rev Lett. 2014 Jun 6;112(22):223902. doi: 10.1103/PhysRevLett.112.223902. Epub 2014 Jun 4.
The interaction between a large number of laser filaments brought together using weak external focusing leads to the emergence of few filamentary structures reminiscent of standard filaments, but carrying a higher intensity. The resulting plasma is measured to be 1 order of magnitude denser than for short-scale filaments. This new propagation regime is dubbed superfilamentation. Numerical simulations of a nonlinear envelope equation provide good agreement with experiments.
大量激光丝通过弱外部聚焦聚集在一起相互作用，会产生少量丝状结构，这些丝状结构让人联想到标准丝状结构，但强度更高。测量得到的等离子体密度比短程丝状结构高一个数量级。这种新的传播模式被称为超丝化。非线性包络方程的数值模拟与实验结果吻合较好。
