Strong Terahertz Radiation from a Liquid-Water Line

Zhang, Liangliang; Wang, Weimin; Wu, Tong; Feng, Shijia; Kang, Kai; Zhang, Cunlin; Zhang, Yan; Li, Yutong; Sheng, Zheng-Ming; Zhang, Xicheng

doi:10.1103/physrevapplied.12.014005

Cited by 58 publications

(35 citation statements)

References 31 publications

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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%

“…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%

“…The single-color excitation of acetone jet in the recent paper [9] gave an optical-to-terahertz conversion efficiency value comparable to the case of two-color laser filamentation in atmospheric air. Moreover, the authors of [10] have successfully modified the experimental setup replacing the flat liquid jets by liquid columns, thus, increasing THz generation efficiency by an order of magnitude. However, such values are still insufficient for ubiquitous applications.…”

Section: Introductionmentioning

confidence: 99%

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Double-pump technique – one step closer towards efficient liquid-based THz sources

Ponomareva¹,

Tcypkin²,

Smirnov³

et al. 2019

Opt. Express

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By irradiating a water jet with double pulses, we demonstrate 4-fold higher THz wave generation than for a single pump pulse. The dependence of the enhanced THz signal on the temporal delay between two collinear pulses reveals the optimal time for launching signal pulse is near 2-4 ps, which corresponds to the time needed to create the complete pre-ionization state when sufficient electron density is already induced, and there is no plasma reflection of the pump pulse radiation. The increase in THz waves generation efficiency corresponds to the case of water jet excitation by the pulses with an optimal duration for a certain jet thickness, which is determined by the spatial pulse size. Using a theoretical model of the interaction of a high-intensity sub-picosecond pulse with an isotropic medium, we held a numerical simulation, which well describes the experimental results when using 3 ps value of population relaxation time. Thus, in this work, double pump method allows not only to increase the energy of the generated THz waves, but also to determine the characteristic excited state lifetime of liquid water. The optical-to-terahertz conversion efficiency in case of double pulse excitation of water column is of the order of 0.5·10 −3 , which 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.

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Section: Thz Radiation Energy Enhancement In Water Columnsmentioning

confidence: 86%

Section: Thz Radiation Energy Enhancement In Water Columnsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Double-pump technique – one step closer towards efficient liquid-based THz sources

Ponomareva¹,

Tcypkin²,

Smirnov³

et al. 2019

Opt. Express

Self Cite

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“…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%

Preference of subpicosecond laser pulses for terahertz wave generation from liquids

et al. 2020

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Terahertz (THz) wave generation from laser-induced air plasma generally requires a short temporal laser pulse. In contrast, it was observed that THz radiation from ionized liquid water prefers a longer pulse, wherein the mechanism remains unclear. We attribute the preference for longer pulse duration to the process of ionization and plasma formation in water, which is supported by a numerical simulation result showing that the highest electron density is achieved with a subpicosecond pulse. The explanation is further verified by the coincidence of our experimental result and simulation when the thickness of the water is varied. Other liquids are also tested to assure the preference for such a pulse is not exclusive to water.

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Laser‐Driven Strong‐Field Terahertz Sources

Fülöp

Tzortzakis

Kampfrath

2019

Advanced Optical Materials

250

145

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reason for this interest relies on the fact that THz radiation can couple resonantly to numerous fundamental motions of ions, electrons, and electron spins in all phases of matter. For example, in solids, the THz range overlaps with the frequency of lattice vibrations (phonons), the collision rates of conduction electrons, the binding energy of bound electron-hole pairs (excitons), and the precession frequency of spin waves (magnons). Consequently, THz radiation, both continuous-wave and pulsed, has been used for characterization of and gaining insight into elementary processes in complex materials. The majority of these studies used relatively weak THz fields and, thus, probed the linear response of the material, without inducing notable material modifications.Only recently, however, completely new avenues in THz science were opened up by triggering nonlinear THz responses of materials. [3][4][5][6][7][8][9][10][11][12][13] Instead of using weak fields to primarily observe selected THz modes such as phonons or magnons, strong fields allow one to actively drive them to unprecedentedly large amplitudes, potentially thereby resulting in novel states of matter. [6,8,11] For example, simulations suggest that exciting matter with intense THz transients may lead to massive modifications of electrically [14] or magnetically [15] ordered domains and enable the acceleration of free ions to ≈1 MeV, [16] and postacceleration to 50-100 MeV energies. [17] Remarkable experimental results such as switching of magnetic order, [18,19] parametric amplification of optical phonons, [20] novel insights into spin-lattice coupling, [21,22] and acceleration of free electrons in a THz linear accelerator [23] were achieved only recently. This progress has been made possible by the development of laser-driven table-top THz sources routinely providing pulses with unprecedented energies and peak electric and magnetic field strengths throughout the entire THz spectral range. Different laser-based THz pulse generation techniques can be used to access different parts of the spectral range extending from 0.1 to 10 THz. Some of the recently developed technologies enable the generation of radiation with even larger bandwidth or tuning range up to 100 THz and beyond, which lead to an extension of what is called the THz spectral range. An overview of the approximate spectral coverage and the achieved highest pulse energies and peak electric-field strengths of various laserdriven technologies is given in Figure 1. ScopeIn this work, the basic principles of femtosecond-laser-driven intense pulsed THz sources and their recent development are reviewed. These sources are capable of delivering peak electric field strengths on the MV cm −1 scale. Corresponding typical THz pulse energies are on the µJ-to-mJ level, depending on A review on the recent development of intense laser-driven terahertz (THz) sources is provided here. The technologies discussed include various types of sources based on optical rectification (OR), spintronic emitters, and laserfilame...

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Strong Terahertz Radiation from a Liquid-Water Line

Cited by 58 publications

References 31 publications

Double-pump technique – one step closer towards efficient liquid-based THz sources

Double-pump technique – one step closer towards efficient liquid-based THz sources

Preference of subpicosecond laser pulses for terahertz wave generation from liquids

Laser‐Driven Strong‐Field Terahertz Sources

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