量子电子学报, 2017, 34 (2): 162, 网络出版: 2017-03-29
空间非均匀场下H+2分子发射谐波及阿秒脉冲的理论研究
Theoretical investigation on harmonic emission and attosecond pulse generation from H+2 molecule under spatial inhomogeneous field
激光物理 高次谐波 阿秒脉冲 H+2分子 空间非均匀激光场 laser physics high-order harmonic generation attosecond pulse H+2 molecule spatial inhomogeneous laser field
摘要
理论研究了空间非均匀场下H+2分子发射高次谐波及阿秒脉冲的特点。计算结果表明:适当 调节H+2分子的核间距离及空间非均匀参数,谐波发射的截止能量明显增强,谐波谱的干涉结构也 明显减小。引入单极控制激光场,谐波截止能量得到进一步扩展,形成一个由单一量子路径贡献而成的530 eV带宽的超长平台区。 通过叠加谐波可获得一系列脉宽范围在32~46 as的阿秒X射线脉冲。
Abstract
High-order harmonic emission and attosecond pulse generation from H+2 molecule driven by the spatial inhomogeneous laser field are theoretically investigated. Calculation results show that by properly adjusting the internuclear distance of H+2 molecule and spatial inhomogeneous parameters, the cutoff energy of harmonic emission is remarkably enhanced, and the interference structure of harmonic spectrum is also reduced. By introducing unipolar control laser field, the harmonic cutoff energy is further extended, and a 530 eV bandwidth long platform area contributed by a single quantum path is formed. By superposition of harmonics, a series of attosecond X-ray pulses with the pulse width ranging from 32 as to 46 as can be obtained.
刘航, 冯立强. 空间非均匀场下H+2分子发射谐波及阿秒脉冲的理论研究[J]. 量子电子学报, 2017, 34(2): 162. LIU Hang, FENG Liqiang. Theoretical investigation on harmonic emission and attosecond pulse generation from H+2 molecule under spatial inhomogeneous field[J]. Chinese Journal of Quantum Electronics, 2017, 34(2): 162.