2019
DOI: 10.1103/physrevapplied.12.014005
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Strong Terahertz Radiation from a Liquid-Water Line

Abstract: Terahertz radiation generation from liquid water has long been considered to be impossible due to strong absorption. A few very recent works reported terahertz generation from water, but the mechanism is not clear and the efficiency demands to be enhanced. We show experimentally that strong single-cycle terahertz radiation with field strength of 0.2 MVcm −1 is generated from a water line/column of ∼ 200µm in diameter irradiated by a mJ femtosecond laser beam. This strength is 100-fold higher than that produced… Show more

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Cited by 62 publications
(36 citation statements)
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“…Although modifying jet configuration, we get the same enhancement range up to 20 ps. An estimate of the conversion efficiency of 0.5·10 −3 is obtained by comparing the energy enhancement in case of single pulse [10] and double pulse excitation and exceeds the typical values for THz waves generation during two-color filamentation in air and comparable with the achievable values due to the optical rectification in some crystals. All of the above require some theoretical justification.…”
Section: Thz Radiation Energy Enhancement In Water Columnsmentioning
confidence: 86%
See 2 more Smart Citations
“…Although modifying jet configuration, we get the same enhancement range up to 20 ps. An estimate of the conversion efficiency of 0.5·10 −3 is obtained by comparing the energy enhancement in case of single pulse [10] and double pulse excitation and exceeds the typical values for THz waves generation during two-color filamentation in air and comparable with the achievable values due to the optical rectification in some crystals. All of the above require some theoretical justification.…”
Section: Thz Radiation Energy Enhancement In Water Columnsmentioning
confidence: 86%
“…In the second part of the experimental study, we present enhanced THz signal measurements with double pulse excitation of water columns. The authors of work [10] introduced the experimental setup modification, replacing flat liquid jets by liquid columns. The benefit of using columns is in decreasing the total internal reflection of the THz wave at the liquid-air interface.…”
Section: Thz Radiation Energy Enhancement In Water Columnsmentioning
confidence: 99%
See 1 more Smart Citation
“…21,22 Recently, THz wave generation from liquids under the excitation of intense laser pulses has been reported as well. [23][24][25][26][27] The generation process of THz radiation from liquids 23,25,26 resembles that from gases, due to the fact that laser-induced ionization plays a significant role in both generation processes. In both cases, a model based on a ponderomotive force-induced dipole has been commonly used for the one-color excitation scheme, 25,[27][28][29] and a transient current model was successfully applied for the two-color excitation scheme.…”
Section: Introductionmentioning
confidence: 99%
“…[23][24][25][26][27] The generation process of THz radiation from liquids 23,25,26 resembles that from gases, due to the fact that laser-induced ionization plays a significant role in both generation processes. In both cases, a model based on a ponderomotive force-induced dipole has been commonly used for the one-color excitation scheme, 25,[27][28][29] and a transient current model was successfully applied for the two-color excitation scheme. 26,[30][31][32] Remarkably, one distinction between the two cases is that the dependence of THz radiation on the optical pulse duration is very different: THz radiation from gases favors a short optical pulse, whereas a longer pulse offers stronger THz emission in liquids.…”
Section: Introductionmentioning
confidence: 99%