论文标题
双重驱动器启用了原子靶标中高谐波产生的控制
Bi-chromatic driver enabled control of high harmonic generation in atomic targets
论文作者
论文摘要
我们通过与原子靶标相互交互的，线性极化的激光脉冲来研究高阶谐波生成。继发于初级场（$ω_2/ω_1$）的频率比以及两个脉冲之间的相对载波 - 内维波遗相（CEP）以及相应的时间延迟在控制电子电离的电离和连续量的量子动力学方面非常有用。我们观察到给定双重频率比的最佳CEP（$ ϕ $）和时间延迟（$ T_D $），可提供最大的截止能量。我们研究了CEP和固定频率比的时间延迟的效果，并观察到可以以实验可行的方式控制谐波截止。此外，还计算了能量范围140 eV $ - $ 240 eV的谐波产量，并且观察到谐波产量量表为$ \ propto -\ sqrt ϕ $。还通过在相同能量范围内超级谐波来计算出不同CEP的Attsond脉冲，并且随着CEP的各个谐波产率的变化，观察到脉冲的频率为脉冲，峰值强度随CEP的降低而降低。
We investigated the high-order harmonic generation by interacting time-delayed, linearly polarized bi-chromatic laser pulses with the atomic target. The frequency ratio of secondary to primary fields ($ω_2/ω_1$), along with the relative carrier-envelope-phase (CEP) and respective time-delay between the two pulses, are very instrumental in controlling the ionization of the electron and so the quantum dynamics in continuum. We observed an optimum CEP ($ϕ$) and time delay ($t_d$) for a given bi-chromatic frequency ratio, giving maximum cutoff energy. We studied the effect of CEP and time delay for fixed frequency ratio and observed that the harmonic cutoff could be controlled in an experimentally feasible way. Moreover, the harmonic yield in the energy range 140 eV $-$ 240 eV is also calculated, and it is observed that the harmonic yield scales as $\propto -\sqrtϕ$. The attosecond pulses for different CEP is also calculated by superposing the harmonics in the same energy range, and $\sim 200$ as pulses are observed with peak intensity decreasing with CEP, following the variation of respective harmonic yield with CEP.
