Observation of Millimeter Range Radiation with TM01 Mode by Laser Plasma Interaction Experiments
Observation of Millimeter Range Radiation with TM01 Mode by Laser Plasma Interaction Experiments
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DOI：
10.1143/jjap.45.l1051
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发表时间：
2006-09
影响因子：
1.5
通讯作者：
N. Yugami;K. Ninomiya;Kazuhiro Kobayashi;H. Noda
中科院分区：
文献类型：
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作者：
N. Yugami;K. Ninomiya;Kazuhiro Kobayashi;H. Noda
在激光等离子体相互作用实验中，观测到了毫米波段的宽光谱辐射。辐射的光谱区域范围是从26.5到325 GHz，这是本探测器的上限，脉冲持续时间为200 ps。辐射的方向相对于激光方向对称30 °至60°，并且其成孔在径向方向上，即，TM01模式。这表明辐射是由等离子体电子在激光产生的不可移动的离子柱的电场下的径向振荡产生的。辐射的频率取决于电子的初始速度，该速度由激光产生的有质动力在焦斑处加速。为了解释辐射的角分布，从等离子体柱发射辐射。分布的数值计算与实验数据吻合较好。
Radiation in the millimeter range with a broad spectrum was observed in laser plasma interaction experiments. The spectral region range of the radiation is from 26.5 to 325 GHz, which is the upper limit of the present detector, with a pulse duration of 200 ps. The direction of the radiation is symmetrical from 30 to 60° with respect to the laser direction, and its poralization is in the radial direction, i.e., the TM01 mode. This suggests that the radiation is generated by the radial oscillation of plasma electrons under the electric field of a laser generated immovable ion column. The frequency of the radiation depends on the initial electron velocity that is accelerated by the laser-generated ponderomotive force at the focal spot. To explain the angular distribution of the radiation, the radiation is emitted from the plasma column. The numerical calculation of the distribution is in good agreement with the experimental data.