Large anisotropy of the electron distribution function in the high-density plasma produced by an ultrashort-pulse UV laser
Large anisotropy of the electron distribution function in the high-density plasma produced by an ultrashort-pulse UV laser
复制标题
超短脉冲紫外激光器产生的高密度等离子体中电子分布函数的大各向异性
DOI：
10.1103/physreve.56.988
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发表时间：
1997
影响因子：
2.4
通讯作者：
K. Ueda
中科院分区：
文献类型：
--
作者：
H. Yoneda;N. Hasegawa;S. Kawana;K. Ueda
用x射线偏振光谱法测量了高密度等离子体中电子分布函数的各向异性。使用预脉冲控制的KrF激光器产生密度高达10{sup 22} cm{sup{负}3}的等离子体。在高密度等离子体中，当碰撞时间小于激光脉冲长度时，观察到较大的束状各向异性。这种各向异性的方向与入射激光场的偏振方向一致。当激光的偏振由p极化变为s极化时，各向异性的振幅减小。结果表明，观察到的各向异性是由外加激光场引入的，x射线偏振光谱是诊断超短脉冲激光产生的高密度等离子体的良好工具。{版权所有}{ital 1997} {ital美国物理学会}
Anisotropy of the electron distribution function in a high-density plasma was measured with x-ray polarization spectroscopy. A prepulse controlled KrF laser was used to produce a plasma with a density of up to 10{sup 22} cm{sup {minus}3}. In the high-density plasma, a large beamlike anisotropy was observed when the collision time was less than the laser pulse length. The direction of this anisotropy was aligned with the polarization of the incident laser field. The amplitude of the anisotropy was reduced when the polarization of the laser was changed from p to s polarization. These results show that the observed anisotropy was introduced by the applied laser field and that x-ray polarization spectroscopy is a good tool for diagnosing high-density plasmas created by ultrashort-pulse lasers. {copyright} {ital 1997} {ital The American Physical Society}