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.
| Original language | English |
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| Pages (from-to) | 3211-3213 |
| Number of pages | 3 |
| Journal | Optics Letters |
| Volume | 34 |
| Issue number | 20 |
| DOIs | |
| State | Published - 15 Oct 2009 |