利用高振动态H_2^+增强谐波及脉冲强度

Enhancement of Harmonic and Pulse Intensity by Using High-Vibrational State of H_2^+

通过求解核与电子耦合的动力学方程,理论研究了H_2^+振动态对谐波辐射以及阿秒脉冲强度的影响。结果表明,随着H_2^+振动态增大,谐波辐射强度明显被增强。随后,通过引入啁啾激光参数,谐波截止能量可以得到有效延伸,并且呈现1个325 eV的超长连续平台区。最后,通过傅里叶变换该平台区的谐波光谱,获得了脉宽仅为20 as的超短单个阿秒脉冲。

The effects of the vibrational state in H2^＋ on the harmonic emission yield and the attosecond pulse intensity have been theoretically investigated through solving the electron-nuclear dynamic equation. The results show that as the vibrational state of H2^＋ increases, the harmonic yield can be remarkably enhanced. Further, with the introduction of the chirp parameter, the harmonic cutoff can be effectively extended, showing the bandwidth of 325 e V. Finally, through the Fourier transform of the harmonic spectrum, an isolated attosecond pulse with the pulse duration of 20 as can be produced.