基于激光等离子体的光子加速

利用一维动量方程、连续性方程和泊松方程，导出了由于短脉冲激光入射到稀薄等离子体中 而引起的电子密度扰动，它与入射激光密切相关.而密度扰动的传播形成电子等离子体波(尾 波场).利用光学度规的方法,研究了与驱动激光脉冲入射相距一定空间距离入射的尾随激光 脉冲由于尾波场的作用引起的光子频率的增大.结果表明，在一定条件下，入射到尾波场中 的光子可以从尾波场中获得能量，在光子总数不变时，光子频率会增大，光子获得加速. 关键词： 电子密度扰动 光学度规 光子加速

PHOTON ACCELERATION BASED ON LASER-PLASMA

The one-dimensional electron density perturbation is derived by using the cold f luid equation, Poisson's equation and the continuity equation, which is generated by a driving laser pulse propagating through a tenuous plasma. The upshifting of the frequency of a trailing pulse induced by density perturbation is studied by using optical metric. The results show that it is possible that the photon wi ll gain energy from the wake field when assuming photon number to be conserved, i.e., the photon will be accelerated.