ntvНаучно-технический вестник информационных технологий, механики и оптикиScientific and Technical Journal of Information Technologies, Mechanics and Optics2226-14942500-0373Университет ИТМО10.17586/2226-1494-2024-24-3-399-405ntv-268Research ArticleФОТОНИКА И ОПТОИНФОРМАТИКАPHOTONICS AND OPTOINFORMATIСSОценка плотности плазмы в воде на основе теории Келдыша при изменении длины волны накачкиInsights from Keldysh theory to plasma electron density in liquid water under excitation wavelength scalinghttps://orcid.org/0009-0005-2820-5379ХилалШ.HilalSh.

Хилал Ширин — аспирант

Санкт-Петербург, 197101

Shireen Hilal — PhD Student

Saint Petersburg, 197101

https://orcid.org/0000-0002-5844-2966ИсмагиловА. О.IsmagilovA. O.

Исмагилов Азат Олфатович — кандидат физико-математических наук, научный сотрудник

Санкт-Петербург, 197101

Azat O. Ismagilov — PhD (Physics & Mathematics), Scientific Reseacher

Saint Petersburg, 197101

https://orcid.org/0000-0002-9254-1116ЦыпкинА. Н.TcypkinA. N.

Цыпкин Антон Николаевич — доктор физико-математических наук, доцент, старший научный руководитель

Санкт-Петербург, 197101

Anton N. Tcypkin — D.Sc (Physics & Mathematics), Associate Prifessor, Senior Researcher

Saint Petersburg, 197101

https://orcid.org/0000-0002-0796-0659МельникМ. В.MelnikM. V.

Мельник Максим Владимирович — кандидат физико-математических наук, доцент

Санкт-Петербург, 197101

Maksim V. Melnik — PhD (Physics & Mathematics), Associate Professor

Saint Petersburg, 197101

Университет ИТМОРоссияITMO UniversityRussian Federation202416122024243399405Copyright © Хилал Ш., Исмагилов А.О., Цыпкин А.Н., Мельник М.В., 20242024Хилал Ш., Исмагилов А.О., Цыпкин А.Н., Мельник М.В.Hilal S., Ismagilov A.O., Tcypkin A.N., Melnik M.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://ntv.elpub.ru/jour/article/view/268

Введение. Исследование генерации плазмы в жидкостях актуально для многих областей применения. Главным образом данное исследование применяется для повышения эффективности генерации терагерцового излучения. В работе исследуется взаимосвязь между длиной волны лазерной накачки и плотностью плазмы для воды в ближнем инфракрасном диапазоне спектра. Метод. Методами численного моделирования, основанного на теории Келдыша, выполнен анализ закономерности изменений скорости ионизации и плотности плазмы от длины волны накачки. Основные результаты. Полученные результаты показали наличие взаимного влияния сверхпороговой ионизации и туннельных эффектов, преимущественно в случае, когда параметр Келдыша близок к единице. Показано снижение плотности плазмы при увеличении длины волны излучения накачки. Однако при этом было выявлено локальное увеличение плотности плазмы в определенных диапазонах длин волн. Обсуждение. Полученные теоретические результаты согласуются с экспериментальными данными подобных научных работ. В результате теоретического исследования получена важная информация о модуляции плотности плазмы с помощью изменения длин волн лазерного возбуждения, что имеет значение для повышения эффективности генерации терагерцового излучения.

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.

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The authors declare that there are no conflicts of interest present.