利用远紫外光产生多重谐波截止能量延伸

数值研究了氦离子在红外激光场与远紫外激光场驱动下辐射高次谐波的过程.计算结果表明,当远紫外激光场加入后,电子在与母核回碰的过程中会再吸收远紫外光子,进而导致谐波截止能量以远紫外光子能量为间隔的延伸.随着远紫外激光场场强的增强,电子在回碰过程中会吸收更多的远紫外光子,因此多重谐波截止能量会进一步延伸.最后,随着红外激光场与远紫外激光场延迟时间的改变,多重谐波截止能量的延伸可以得到调控.

Multi-harmonic cutoff extension by using XUV pulse

High-order harmonic generation from He+ ion driven by the combined infrared pulse and the XUV pulse has been theoretically investigated. The calculated results show that with the introduction of the XUV pulse, the electron can receive the extra XUV photons during the recombination process, thus leading to the multi-harmonic cutoff extension separated by the XUV photon energy. As the intensity of the XUV pulse increases, the more XUV photons will be absorbed during the recombination process, thus resulting in the further extension of the multi-harmonic cutoff. Finally, the multi-harmonic cutoff extension can be controlled by changing the delay time between the infrared pulse and the XUV pulse.