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Updated: Jun 19, 2026

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
Published on: April 25, 2019
Interaction of two parallel femtosecond filaments at different wavelengths in air
Jian Wu1, Yuqi Tong, Xuan Yang
1State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
Abstract:
We study the interaction of two parallel-launched femtosecond filaments at their fundamental-wave and second-harmonic frequencies in air. Besides the Kerr effect within the pulse duration, the impulsive alignment of the diatomic molecules in the fundamental-wave filament leads to controllable and field-free achievable attraction, fusion, or repulsion of the second-harmonic filament. The molecular-alignment-assisted filament interaction is further confirmed by the fluorescence intensity variation and spectral modulation of the second-harmonic filament at various molecular alignment revivals.
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