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

被引：0
|
作者：
Zyatikov, I. A. [1 ]
Losev, V. F. [1 ]
机构：
[1] Russian Acad Sci, Inst High Current Elect, Siberian Branch, Akademichesky Ave 2-3, Tomsk 634055, Russia
来源：
HIGH ENERGY DENSITY PHYSICS | 2025年 / 55卷
关键词：
Electron density; Laser plasma; Keldysh parameter; Femtosecond laser pulses; IONIZATION; FILAMENTATION; DYNAMICS; FIELD;
D O I：
10.1016/j.hedp.2025.101190
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
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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页数：4
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