理论研究了空间非均匀场下H2+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H2+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32～46as的阿秒X射线脉冲.
High-order harmonic emission and attosecond pulse generation from H2+ molecule driven by the spatial inhomogeneous laser field are theoretically investigated.Calculation results show that by properly adjusting the internuclear distance of H2+ 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.
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