时-空域波形优化延伸高次谐波截止能量的研究
Study on time-space waveform optimization for extension of high-order harmonic cutoff energy
王佳琪 1冯立强 2刘航1
作者信息
- 1. 辽宁工业大学 化学与环境工程学院,锦州 121001
- 2. 辽宁工业大学 理学院,锦州 121001
- 折叠
摘要
在高次谐波发射三步模型的指导下,理论研究了三色场时-空域波形调控对谐波截止能量的影响.在时域调控下,通过改变三束激光场的强度比、相位和延迟时间获得了最佳的三色场时域波形.在该波形下,谐波截止能量得到最佳延伸.在空间调控下,在上述最佳波形的基础上选择适当的正向激光非均匀效应后,谐波截止能量得到了进一步延伸.并且,随着非均匀参数增大,谐波截止能量也可持续增大.通过分析激光波形、空间非均匀效应和谐波发射过程给出了谐波截止能量延伸的原因.并且,通过叠加部分谐波可获得脉宽为45 as的单个脉冲.
Abstract
Based on the three-step model of high-order harmonic generation,the effect of time-space wave-form control on the extension of the harmonic cutoff energy has been theoretically studied.In the case of time re-gion waveform control,by properly changing the laser intensity ratio,the laser phase and the time delay,the op-timal three-color laser waveform can be obtained.Driven by this laser waveform,the harmonic cutoff can be ex-tended.In the case of space region waveform control,based on the above best waveform as well as by choosing the appropriate positive laser inhomogeneous effect,the harmonic cutoff energy can be further extended.Moreo-ver,with the increase of the inhomogeneous parameter,the harmonic cutoff can be extended.By analyzing the laser waveform,the spatial inhomogeneous effect and the harmonic emission process,the reason for the extension of the harmonic cutoff energy can be found.Furthermore,by properly superposing some harmonics,a single at-tosecond pulse with a duration of 45 as can be obtained.
关键词
三色激光场/空间非均匀激光场/高次谐波/波形优化/阿秒脉冲Key words
Three-color laser pulse/Spatial inhomogeneous laser pulse/High-order harmonic generation/Waveform optimization/Attosecond pulse引用本文复制引用
基金项目
辽宁省教育厅青年项目(LJKQZ2021138)
大学生创新创业项目(S202210154011)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据