Insights from Keldysh theory to plasma electron density in liquid water under excitation wavelength scaling
https://doi.org/10.17586/2226-1494-2024-24-3-399-405
Abstract
The study of plasma generation in liquids is relevant for many applications, especially for increasing the efficiency of terahertz radiation generation. This work investigates the relationship between the laser excitation wavelength and the plasma electron density in liquid water in the near-infrared spectral range. Using numerical simulation methods based on the Keldysh theory, patterns of changes in the ionization rate and changes in the plasma electron density depending on the excitation wavelength are analyzed. The results show the mutual influence of above-threshold ionization and tunneling effects when the Keldysh parameter is close to one. A decrease in plasma electron density with increasing excitation wavelength has been shown. However, in certain wavelength ranges a local increase in plasma electron density was observed. The theoretical results obtained are consistent with the experimental data of other scientific groups. This theoretical study provides valuable information on the modulation of plasma electron density by changing laser excitation wavelengths, which is important for increasing the efficiency of terahertz radiation generation.
Keywords
plasma,
Keldysh theory,
ionization,
liquid,
wavelength,
plasma-based THz generation,
plasma electron density
Supporting agencies: This work was supported by the Ministry of Science and Higher Education of the Russian Federation (grant No. 2019-0903).
About the Authors
Sh. Hilal
ITMO University
Russian Federation
Russian Federation
Shireen Hilal — PhD Student
Saint Petersburg, 197101
A. O. Ismagilov
ITMO University
Russian Federation
Russian Federation
Azat O. Ismagilov — PhD (Physics & Mathematics), Scientific Reseacher
Saint Petersburg, 197101
A. N. Tcypkin
ITMO University
Russian Federation
Russian Federation
Anton N. Tcypkin — D.Sc (Physics & Mathematics), Associate Prifessor, Senior Researcher
Saint Petersburg, 197101
M. V. Melnik
ITMO University
Russian Federation
Russian Federation
Maksim V. Melnik — PhD (Physics & Mathematics), Associate Professor
Saint Petersburg, 197101
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Review
For citations:
Hilal Sh., Ismagilov A.O., Tcypkin A.N., Melnik M.V. Insights from Keldysh theory to plasma electron density in liquid water under excitation wavelength scaling. Scientific and Technical Journal of Information Technologies, Mechanics and Optics. 2024;24(3):399-405. https://doi.org/10.17586/2226-1494-2024-24-3-399-405
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