Electron density in air laser plasma created by femtosecond pulses of laser radiation

IF 1.6 3区物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS

High Energy Density Physics Pub Date : 2025-03-17 DOI:10.1016/j.hedp.2025.101190

I.A. Zyatikov, V.F. Losev

引用次数: 0

Abstract

The results of experimental studies of electron density in air laser plasma, created by femtosecond radiation pulse at the wavelength of 950 nm and 60 fs duration are presented. Laser pulse was focused by lens with focal lengths from 15 to 100 cm to create a laser plasma. Electron density was determined from specific deposited energy in plasma. It is shown that when changing the specific deposited energy from 0.4 to 10 J/cm³ the electron density in plasma changes from 1.7⸱10¹⁷ to 3.9⸱10¹⁸ cm⁻³. Qualitative estimates of ionization mechanisms based on calculations of Keldysh parameter are carried out. It is shown that in our experimental conditions the main mechanism is multiphoton ionization.

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来源期刊

High Energy Density Physics PHYSICS, FLUIDS & PLASMAS-

CiteScore

4.20

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： High Energy Density Physics is an international journal covering original experimental and related theoretical work studying the physics of matter and radiation under extreme conditions. ''High energy density'' is understood to be an energy density exceeding about 1011 J/m3. The editors and the publisher are committed to provide this fast-growing community with a dedicated high quality channel to distribute their original findings. Papers suitable for publication in this journal cover topics in both the warm and hot dense matter regimes, such as laboratory studies relevant to non-LTE kinetics at extreme conditions, planetary interiors, astrophysical phenomena, inertial fusion and includes studies of, for example, material properties and both stable and unstable hydrodynamics. Developments in associated theoretical areas, for example the modelling of strongly coupled, partially degenerate and relativistic plasmas, are also covered.