基于高对称点间干涉的固体高次谐波偏振操控  

Polarization control of high-order harmonic generation via the interference effect between high-symmetry points in solid

作　　者：龙杰 李文清 祝晓松[1,3] 李亮 兰鹏飞 陆培祥 LONG Jie;LI WenQing;ZHU XiaoSong;LI Liang;LAN PengFei;LU PeiXiang(School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China;Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China;Hubei Optical Fundamental Research Center,Wuhan 430074,China)

机构地区：[1]华中科技大学物理学院,武汉430074 [2]华中科技大学武汉光电国家研究中心,武汉430074 [3]湖北光谷实验室,武汉430074

出　　处：《中国科学:物理学、力学、天文学》2025年第1期100-108,共9页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:12174134,12021004);国家重点基础研究发展计划(编号:2023YFA1406800,2022YFA1604403)资助项目。

摘　　要：椭偏超短脉冲对手性相关的超快动力学研究至关重要.产生椭偏超短脉冲的关键在于获得连续阶次具有相同旋向的大椭偏高次谐波.本文提出了一种可以获得连续阶次具有相同旋向的大椭偏高次谐波的方法.该方法利用了固体介质倒空间中的不同高对称点附近区域贡献的高次谐波之间的干涉效应.以同向旋转双色圆偏光驱动石墨烯为例,通过理论模拟演示了这一方案.结果表明,在产生的谐波信号中,一个旋向的谐波分量由于相消干涉被抑制,而另一个旋向的谐波分量由于相长干涉得到增强并在谐波谱中占主导.该方法为有效产生椭偏阿秒超短脉冲提供了新的思路.Elliptic harmonics with the same helicity across a wide spectral range are key points for the generation of elliptically polarized ultrashort radiation sources,which are highly demanded in ultrafast spectroscopy of chirality-sensitive dynamics.In this paper,we propose an approach for the generation of elliptic harmonics with the same helicity across a wide spectral range.This method utilizes the interference effect of solid high-order harmonics radiated from different regions in the reciprocal space.We demonstrate this scheme by taking the high-harmonic generation of graphene in corotating bicircular laser fields as an example.The results show that one of the helicity components of harmonics can be significantly suppressed by destructive interference.Meanwhile,the component with opposite helicity is enhanced and dominates the harmonic spectrum due to constructive interference.The proposed method has the potential to generate elliptically polarized attosecond pulses.

关 键 词：高次谐波 椭偏超短脉冲 干涉效应 

分 类 号：O437[机械工程—光学工程]