共 12 条
Investigation of optical-field ionized plasmas by Thomson scattering
被引:0
作者:
Jost, CM
[1
]
Fill, EE
[1
]
机构:
[1] Max Planck Inst Quantum Opt, D-85748 Garching, Germany
来源:
ECLIM 2000: 26TH EUROPEAN CONFERENCE ON LASER INTERACTION WITH MATTER
|
2001年
/
4424卷
关键词:
optical-field ionization;
Thomson scattering;
diatomic molecules;
Hydrogen;
Deuterium;
electron temperature;
ion temperature;
Coulomb explosion;
spectral blueshift;
alignment;
D O I:
10.1117/12.425551
中图分类号:
O43 [光学];
学科分类号:
070207 ;
0803 ;
摘要:
Using Thomson scattering of laser light we have studied optical-field ionized Hydrogen and Deuterium plasmas with respect to electron density, electron temperature and ion temperature. The plasmas were created by focusing 120 fs, 790 nm pulses of our 10 Hz ATLAS (R) Ti:sapphire laser system to intensities of up to 7x10(16) W/cm(2). The measurements were performed for linear and elliptic polarization of the ionizing laser light. We find that the ion temperatures for Deuterium and Hydrogen are not identical, whereas the corresponding electron temperatures show no significant difference. Considering standard theory for optical-field ionization we would expect much higher electron temperatures for elliptic than for linear laser polarization. But for Deuterium the electron temperature for elliptic polarization is found to be even slightly lower than for linear polarization. Also in case of Hydrogen we find that the electron temperature is almost the same for linear and elliptic polarization. With increasing particle density ionization defocusing of the laser beam and heating of the electrons due to inverse bremsstrahlung gain in significance.
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页码:533 / 536
页数:4
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