稀薄等离子体中激发尾波场的共振条件

Resonant Condition for Wake-Field Excitation in Rare Plasma

研究了在稀薄等离子体中强激光激发尾波场的情况 ,发现尾波场的激发与入射激光的脉冲宽度有共振现象。在光强很小情况下 ,共振所需要的入射激光脉冲宽度为λp 2 ,随着光强的增大共振激光脉冲宽度减小。同时发现在稀薄等离子体中激发的尾波势场与等离子体的密度几乎无关 ,而激发的尾波场最大电场强度与等离子体的密度有关。

The wake-field excitation by intense laser pulse in rare plasma is investigated. The wake-field excitation depends on laser pulse width. The resonant condition is given, as the laser intensity increases, the optimum laser pulse width decreases from the half of the plasma wavelength in a very low laser intensity. In rare plasma, the strength of the wake-field depends on the background plasma density, while the maximum wake potential of wake-field is dependent on it.