Vacuum acceleration of electrons in a dynamic laser pulse.
Vacuum acceleration of electrons in a dynamic laser pulse.
复制标题
动态激光脉冲中电子的真空加速。
作者：
D. Ramsey;P. Franke;T. Simpson;D. Froula;J. Palastro
在真空中传播的平面激光脉冲可以表现出极大的重力动势。然而，这种力不能将净能量传递给电子：当脉冲超过电子时，来自其上升边缘的初始脉冲完全被来自其后缘的大小相反的脉冲所抵消。在这里，我们展示了平面状的“飞焦”脉冲可以打破这种对称性，将相对论能量传递给电子。飞行焦点的强度峰值——由彩色透镜聚焦的啁啾激光脉冲产生的移动焦点——可以以任何亚光速向前或向后传播。因此，电子可以在强度峰的上升边缘获得足够的动量以逃离并避开后缘。加速强度峰值可以进一步提高动量增益。理论和模拟表明，这些动态强度峰可以将电子反向加速到高能密度材料的辐射和电子衍射探针所需的MeV能量。
A planar laser pulse propagating in vacuum can exhibit an extremely large ponderomotive force. This force, however, cannot impart net energy to an electron: As the pulse overtakes the electron, the initial impulse from its rising edge is completely undone by an equal and opposite impulse from its trailing edge. Here we show that planarlike "flying focus" pulses can break this symmetry, imparting relativistic energies to electrons. The intensity peak of a flying focus-a moving focal point resulting from a chirped laser pulse focused by a chromatic lens-can travel at any subluminal velocity, forward or backward. As a result, an electron can gain enough momentum in the rising edge of the intensity peak to outrun and avoid the trailing edge. Accelerating the intensity peak can further boost the momentum gain. Theory and simulations demonstrate that these dynamic intensity peaks can backwards accelerate electrons to the MeV energies required for radiation and electron diffraction probes of high energy density materials.
影响因子：
64.8
作者：
Faure, J;Glinec, Y;Malka, V
通讯作者：
Malka, V