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Waveform control of enhanced THz radiation from femtosecond laser filament in air
We report on a waveform control of enhanced THz radiation along a femtosecond laser filament in air with a high voltage technique. By applying a DC high-voltage electric field from two sharp electrodes in a direction parallel to the laser filament and scanning it along the filament, the longitudinal...
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Published in: | Applied physics letters 2017-05, Vol.110 (22) |
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container_title | Applied physics letters |
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creator | Wang, Tie-Jun Ju, Jingjing Liu, Yaoxiang Li, Ruxin Xu, Zhizhan Leang Chin, See |
description | We report on a waveform control of enhanced THz radiation along a femtosecond laser filament in air with a high voltage technique. By applying a DC high-voltage electric field from two sharp electrodes in a direction parallel to the laser filament and scanning it along the filament, the longitudinal evolution of amplified THz emission was demonstrated. By changing the position of the pair of electrodes along the laser filament, different waveforms of THz radiation were obtained. Due to the change of the plasma density distribution at the leading and trailing ends of a laser filament, the enhanced THz waveforms could have a phase shift of ∼π. The technique is very simple. It could help to understand the THz generation process through external electric field assisted laser filamentation. |
doi_str_mv | 10.1063/1.4984599 |
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By applying a DC high-voltage electric field from two sharp electrodes in a direction parallel to the laser filament and scanning it along the filament, the longitudinal evolution of amplified THz emission was demonstrated. By changing the position of the pair of electrodes along the laser filament, different waveforms of THz radiation were obtained. Due to the change of the plasma density distribution at the leading and trailing ends of a laser filament, the enhanced THz waveforms could have a phase shift of ∼π. The technique is very simple. 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By applying a DC high-voltage electric field from two sharp electrodes in a direction parallel to the laser filament and scanning it along the filament, the longitudinal evolution of amplified THz emission was demonstrated. By changing the position of the pair of electrodes along the laser filament, different waveforms of THz radiation were obtained. Due to the change of the plasma density distribution at the leading and trailing ends of a laser filament, the enhanced THz waveforms could have a phase shift of ∼π. The technique is very simple. It could help to understand the THz generation process through external electric field assisted laser filamentation.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4984599</doi><tpages>4</tpages></addata></record> |
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source | American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list); AIP Journals (American Institute of Physics) |
subjects | Applied physics Density distribution Electric fields Electric potential Electrodes High voltages Lasers Plasma density Waveforms |
title | Waveform control of enhanced THz radiation from femtosecond laser filament in air |
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