Ultrabroad Terahertz Spectrum Generation from an Air-Based Filament Plasma
We have solved the long-standing problem of the mechanism of terahertz (THz) generation by a two-color filament in air and found that both neutrals and plasma contribute to the radiation. We reveal that the contribution from neutrals by four-wave mixing is much weaker and higher in frequency than th...
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| Veröffentlicht in: | Physical review letters 2016-02, Vol.116 (6), p.063902, Article 063902 |
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| creator | Andreeva, V A Kosareva, O G Panov, N A Shipilo, D E Solyankin, P M Esaulkov, M N González de Alaiza Martínez, P Shkurinov, A P Makarov, V A Bergé, L Chin, S L |
| description | We have solved the long-standing problem of the mechanism of terahertz (THz) generation by a two-color filament in air and found that both neutrals and plasma contribute to the radiation. We reveal that the contribution from neutrals by four-wave mixing is much weaker and higher in frequency than the distinctive plasma lower-frequency contribution. The former is in the forward direction while the latter is in a cone and reveals an abrupt down-shift to the plasma frequency. Ring-shaped spatial distributions of the THz radiation are shown to be of universal nature and they occur in both collimated and focusing propagation geometries. Experimental measurements of the frequency-angular spectrum generated by 130-fs laser pulses agree with numerical simulations based on a unidirectional pulse propagation model. |
| doi_str_mv | 10.1103/PhysRevLett.116.063902 |
| format | Article |
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| title | Ultrabroad Terahertz Spectrum Generation from an Air-Based Filament Plasma |
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