利用啁啾共振电离产生高强度阿秒脉冲

High-intensity Attosecond Pulse Generation by Using Chirp Resonance Ionization

理论提出了一种利用啁啾共振电离产生高强度高次谐波和阿秒脉冲的方法。结果表明,在适当选取抽运与探测激光的延迟时间时,H2+谐波辐射效率有明显增强,并且形成一个连续平台区。理论分析表明,该现象是由电荷共振增强电离引起的。随后在探测激光场下引入啁啾调制,谐波截止能量得到延伸。最后,通过傅里叶变换可产生一个48as的激光束。

A method to produce the high-intensity high-order harmonics and attosecond pulses by using the chirp resonance ionization has been theoretically proposed. The results show that by properly choosing the delay time between the pump pulse and the probe pulse, the harmonic emission efficiency can be enhanced and a harmonic plateau can be obtained. Theoretical analyses show that the above phenomenon is caused by the charge-resonance-enhanced-ionization. Further, with the introduction of the chirp in the probe pulse, the harmonic cutoff can be extended. Finally, through the Fourier transform of some harmonics, a 48 as pulse can be produced.