利用相位啁啾单色中红外激光场产生高次谐波

摘要

本文通过求解薛定谔方程,理论探索了高次谐波及孤立阿秒脉冲在相位调制的单色中红外激光场中的产生.研究结果表明,通过加入含时相位啁啾小量,能够有效的提高高次谐波的产生效率,获得超宽平台谐波谱及超短孤立阿秒脉冲.特别是在相位为0.3π的基础上,同时加入啁啾小量βt,在β＝0.3时,可得到带宽为822 eV的超连续高次谐波平台.最后通过叠加第二平台高次谐波,可得到带宽仅为2.7 as的孤立阿秒脉冲.且脉冲强度比没有加入啁啾小量的情况下显著增强.%By solving the time－dependent Schr?dinger equation,we present a theoretical investigation of high－order harmonic and isolated attosecond pulse generation in infrared laser field with phase chirping.It is demon-strated that the yield of the supercontinuum harmonic can be increased and ultroshort isolated attosecond pulse can be obtained by phase chirping.Especially,by the phase of 0.3 πand β＝0.3 in βt,the bandwidth of 822 eV of harmonic spectrum and an isolated 2.7 as pulse can be obtained.Meanwhile,the conversion efficiency of harmonic and intensity of isolated attosecond pulse can be enhanced effectively.