Relativistic air-plasma far-infrared radiation effects by ultrashort laser pulses in air

Mehrabian, Somayeh; Ostrikov, Kostya Ken

doi:10.1016/j.hedp.2019.100708

Cited by 2 publications

(1 citation statement)

References 60 publications

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“…It is worth noting that the space charge effects have been studied in the beat wave-based THz sources as well as the two colour schemes in which the laser pulses interact with a preformed plasma and not an ionizing gas. [41,42] Therefore, based on our recent work, [43] here we develop a 2D relativistic fluid model to incorporate the space charge effects into ionizing and radiative laser-gas interactions. Indeed, the model investigates the interaction of an ultrashort laser pulse with air which results in an electron-ion plasma formation.…”

Section: Introductionmentioning

confidence: 99%

Space charge effects on radiative ultrashort laser‐plasma interactions: Relativistic fluid model

Mehrabian

Ostrikov

2021

Contributions to Plasma Physics

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Ultrashort laser-gas interaction is a promising candidate for the intense broad band far-infrared radiation in which the gas ionization and the resultant plasma formation occur consequently. The electron current produced in the process is the most important influential parameter which affects the far-infrared radiation generation. Although the interacting forces of the process are the space charge electric and the laser electromagnetic forces, the effect of the former one, has not been investigated on the gas-plasma THz generation. It is noteworthy that the space charge electric force, due to its effect on the electron distribution, has potential influence on the produced electron current and its consequent emission. Here, a 2D relativistic fluid model is presented in which the ions and the resultant space charge field are incorporated. The model investigates the air ionization, electron-ion plasma formation, and the system's evolution, spatiotemporally. Moreover, as the model is based on the transient electron current, as the source for the electromagnetic pulse radiation, it gives the temporal profile of the radiated field in which the space charge effects are observable. Our results show that the space charge field affects the electron velocity and its resultant current. Therefore, the temporal profiles and amplitudes of the radiated field components are affected and their resemblance to the experimental data is enhanced. The results indicate that the amplitude of the radiated field increases in the presence of the space charge field. In addition, it is shown that the space charge effects become more pronounced with the laser intensity.

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Section: Introductionmentioning

confidence: 99%

Space charge effects on radiative ultrashort laser‐plasma interactions: Relativistic fluid model

Mehrabian

Ostrikov

2021

Contributions to Plasma Physics

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A Review of Recombination Coefficients of Neutral Oxygen Atoms for Various Materials

et al. 2023

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Relevant data on heterogeneous surface recombination of neutral oxygen atoms available in the scientific literature are reviewed and discussed for various materials. The coefficients are determined by placing the samples either in non-equilibrium oxygen plasma or its afterglow. The experimental methods used to determine the coefficients are examined and categorized into calorimetry, actinometry, NO titration, laser-induced fluorescence, and various other methods and their combinations. Some numerical models for recombination coefficient determination are also examined. Correlations are drawn between the experimental parameters and the reported coefficients. Different materials are examined and categorized according to reported recombination coefficients into catalytic, semi-catalytic, and inert materials. Measurements from the literature of the recombination coefficients for some materials are compiled and compared, along with the possible system pressure and material surface temperature dependence of the materials’ recombination coefficient. A large scattering of results reported by different authors is discussed, and possible explanations are provided.

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Relativistic air-plasma far-infrared radiation effects by ultrashort laser pulses in air

Cited by 2 publications

References 60 publications

Space charge effects on radiative ultrashort laser‐plasma interactions: Relativistic fluid model

Space charge effects on radiative ultrashort laser‐plasma interactions: Relativistic fluid model

A Review of Recombination Coefficients of Neutral Oxygen Atoms for Various Materials

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