Comparison of various liquids as sources of terahertz radiation from one-color laser filament

Ponomareva, Evgenia A.; Putilin, S. É.; Tcypkin, Anton; Yiwen, E; Kozlov, Sergei A.; Zhang, X.-C.

doi:10.1117/12.2536763

Cited by 2 publications

(3 citation statements)

References 23 publications

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“…Hence, the maximum optical-to-THz conversion efficiency is achieved for an α-pinene jet double-pulse excitation, which is about 0.1%. Similar to previous work, which considered liquid media singlepulse excitation 9 , nonpolar α-pinene demonstrated the highest optical-to-THz conversion due to negligible terahertz absorption and low ionization potential, which leads to the more efficient plasma formation process. Fig.…”

Section: Resultssupporting

confidence: 63%

“…In all experiments, a liquid jet with a thickness of 100 μm is studied. As a generation medium, we choose polar water and ethanol, and nonpolar α-pinene to investigate the effect of the liquid media properties on the optical-to-THz conversion efficiency, which was already essential in the singlepulse case 9 .…”

Section: Methodsmentioning

confidence: 99%

“…The main directions of the laser-driven plasma terahertz source development are the search for an optimal generation medium 6 (with a high damage threshold, weak terahertz wave absorption, pronounced nonlinear effects) and input conditions variation, e.g., changing pump radiation parameters or modifying the experimental scheme configuration. The former includes the research on the generation of terahertz waves in a wide variety of gases 7 , metals 8 , as well as relatively new works on liquid media [9][10][11] . As an example, for input conditions variation, it was shown that the terahertz wave pulse energy could be more than 5fold enhanced by applying the abruptly autofocusing beam instead of the usual Gaussian one under the same conditions 12 .…”

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confidence: 99%

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Varying pre-plasma properties to boost terahertz wave generation in liquids

et al. 2021

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Laser-driven nonlinear phenomena can both reveal the structural features of materials and become the basis for the development of various translated technologies, including highly intense terahertz sources. Here we realize a modified single-color double-pulse excitation scheme for enhancing the terahertz wave generation in flat liquid jets, and we show that the pre-ionization effect is crucial for finding the optimal input conditions. The experimental results, being supported by numerical simulations, reveal the preference for longer pre-pulses to induce the effective ionization process and shorter signals for the strong laser-plasma interaction. In addition to the identified features of the terahertz wave energy enhancement with respect to the duration change for both pulses and their ratio variation, we state the possibility of achieving the optical-to-THz conversion efficiency value up to 0.1% in the case of double-pulse excitation of an α-pinene jet.

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Section: Resultssupporting

confidence: 63%

Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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Varying pre-plasma properties to boost terahertz wave generation in liquids

et al. 2021

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Plasma reflectivity behavior under strong subpicosecond excitation of liquids

et al. 2021

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Emerging laser plasma-based technologies require new knowledge on the optical pump optimization and underlying physics of laser–matter interaction. Plasma in liquid jets is still largely unexplored, although this configuration is actively used as a part of optical devices. Hereby, in this work, we report on the reflectivity-based approach to study the optical properties of the induced plasma and quasi-free electron temporal dynamics. The single-shot experiments provide plasma characteristics relative to the laser pump parameters. A strong angular dependence of the plasma absorptivity, which affects rigorously the reflectivity curve, is demonstrated. Furthermore, twofold higher plasma reflectivity in ethanol is revealed and explained through the theoretical model of ultrashort laser pulse interaction with a thin dielectric surface layer. Finally, the time-resolved fundamental and third harmonic reflection measurements and associated analytical study provide the new insight into the electron density dynamics in the case of optical breakdown in water and ethanol. We believe that these findings are of particular significance for the development of highly efficient plasma-based x rays and THz radiation sources.

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Comparison of various liquids as sources of terahertz radiation from one-color laser filament

Cited by 2 publications

References 23 publications

Varying pre-plasma properties to boost terahertz wave generation in liquids

Varying pre-plasma properties to boost terahertz wave generation in liquids

Plasma reflectivity behavior under strong subpicosecond excitation of liquids

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