The effect of high intensity laser propagation instabilities on channel formation in underdense plasmas
The effect of high intensity laser propagation instabilities on channel formation in underdense plasmas
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DOI：
10.1063/1.1534585
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发表时间：
2003-01
影响因子：
2.2
通讯作者：
Z. Najmudin;K. Krushelnick;M. Tatarakis;E. Clark;C. Danson;V. Malka;D. Neely;M. Santala;A. Dan
中科院分区：
文献类型：
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作者：
Z. Najmudin;K. Krushelnick;M. Tatarakis;E. Clark;C. Danson;V. Malka;D. Neely;M. Santala;A. Dan
实验已使用聚焦到低密度氦等离子体 (ne⩽5×1019 cm−3) 的高功率激光脉冲（高达 50 TW）进行。使用阴影摄影术，观察到激光脉冲可以产生不规则的密度通道，其表现出诸如长波长软管和“香肠状”自聚焦不稳定性等特征。这种现象是高强度效应，并且通常发现这些不稳定性的振荡特征周期对应于离子径向移出最高强度区域所需的时间。
Experiments have been performed using high power laser pulses (up to 50 TW) focused into underdense helium plasmas (ne⩽5×1019 cm−3). Using shadowgraphy, it is observed that the laser pulse can produce irregular density channels, which exhibit features such as long wavelength hosing and “sausage-like” self-focusing instabilities. This phenomenon is a high intensity effect and the characteristic period of oscillation of these instabilities is typically found to correspond to the time required for ions to move radially out of the region of highest intensity.