为了研究激光-等离子体相互作用过程中的光子加速(光子频率上移), 采用数值模拟方法进行了理论计算和数值计算验证, 取得了光子加速的重要计算机模拟结果。结果表明, 等离子体激光相互作用过程中的光子频率上移与所用的激光脉冲形式和脉冲宽度有关, 存在最佳脉冲宽度和脉冲上升宽度, 还存在等离子体电子密度上限。这一结果对进一步研究激光等离子体粒子加速有帮助。

The results of numerical calculation of photon acceleration (photon frequency up shift) in the plasma wakefield driven by asymmetric laser pulses were presented. It is found that the maximum frequency up shift of the accelerated photons depends on the pulse shape and pulse width. There is an optimum pulse width and pulse rising width. There also exists an upper limit on plasma electron density to get the maximum photon frequency up shift. This will be helpful for further study about laser-plasma particle acceleration mechanism.