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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)
Main Authors: Wang, Tie-Jun, Ju, Jingjing, Liu, Yaoxiang, Li, Ruxin, Xu, Zhizhan, Leang Chin, See
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Language:English
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container_title Applied physics letters
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creator Wang, Tie-Jun
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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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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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