飞秒激光大气等离子体通道的平均电子密度修正

The Average Electron Density Correction of Laser Plasma Channels Generated by Femtosecond Laser Pluses in Air

在飞秒激光等离子体通道中的电子密度分布近似为高斯分布的基础上,对文献[5]中所得到的激光等离子体通道中的平均电子密度进行了修正计算.计算结果显示:等离子体通道的平均电子密度约为5.48×1018cm-3,高于文献[5]中的计算结果约一倍.随后从实验所测得的等离子体通道中的电阻率η=0.76 Ωcm出发,验证估算出的平均电子密度约为5.20×1018cm-3.从而证明了飞秒脉冲激光生成等离子体通道中的电子密度分布近似为高斯分布.

With Gaussian electron density profile of the femtosecond laser plasma channels, We modified the average electron density in the channel in Ref. 5. The results show that the average electron density of laser plasma channels is about 5. 48×1018cm-3,which is one time bigger than that of Ref . 5. Then with the conductivity of the plasma channel ,η=0. 76 Ωcm from experiment,the average electron density in the plasma channel was setimated to be ne=5. 20×1018cm-3. Therfore electrom density distribution in the femtosecond laser plasma channel is proved close to be Gaussian.