氩在超短脉冲强激光场中电离电子剩余能的研究

Electron residual energy in argon using ultra-short laser pulses

利用带有抛物面反射电镜的无磁场TOF(Time-Of-Flight)电子能谱仪 ,以氩气作为工作介质 ,测量了不同功率密度、不同气压、不同偏振条件下氩的电子能谱 .结果表明激光脉冲能量 (峰值光强 )增强则相应的电子能谱的幅值会有所增强 ,且会出现新的电子峰 ,即有新的机制参与电离 .充气气压较高时产生了许多低气压时所没有的高能电子 ,而低能电子峰增强幅度不大 .圆偏振光相对于线偏振光有利于高能电子的产生 .

Presents the measurement of the argon electron energy spectrum at different intensities、pressures、polarization in argon using a parabolic mirror time of flight electron energy analyzer, and concludes from the results that the incident laser pulse energy (laser intensity) increases, the relevant amplitude of the electron energy spectrum increases and some new peaks in the spectrum appear due to new ionization mechanism, and points out that many electrons with high energy are generated when the gas media pressures are relatively high, namely the peaks of electrons with high energy increase and the peaks of low energy electrons have little changes; the circularly polarized laser favors the generation of electrons with high energy compared with linearly polarized laser.