标题： 超短脉冲通过亚周期激光场生成的系统分析 显示英文标题

标题： Systematic analysis of an attosecond pulse generation by a sub-cycle laser field

摘要： 我们研究了亚周期驱动场对高次谐波产生（HHG）的影响，重点在于固有啁啾、载波-相位（CEP）和激光周期数。 我们的研究结果表明，激光脉冲的中心频率随脉冲持续时间 $\tau$ 成 $\tau^{-5/4}$ 的比例变化，而阿托啁啾对脉冲持续时间的依赖关系类似。 此外，我们发现了谐波产率的CEP特异性趋势：对于 $\phi_0=0^\circ$ ，它随 $\tau^{5/4}$ 增加，而对于 $\phi_0= -90^\circ$ ，它随 $\tau^{-4.1}$ 减少。 尽管亚周期脉冲可以产生强烈的孤立阿托秒脉冲（IAPs），但它们也容易产生更高的阿托啁啾和降低的截止能量。 然而，有效的阿托啁啾补偿可以减轻这些缺点，从而提高亚周期脉冲生成短持续时间、高强度IAPs的能力。 这些结果为使用亚周期脉冲进行HHG提供了有价值的见解，并对超快光源的发展以及对阿托秒时间尺度上超快现象的理解具有重要意义。 显示英文摘要

摘要： We investigated the influence of sub-cycle driving fields on high-order harmonic generation (HHG), with a focus on intrinsic chirp, carrier-envelope phase (CEP), and number of laser cycles. Our findings reveals that the center frequency of a laser pulse scales as $\tau^{-5/4}$ with pulse duration $\tau$, and that attochirp exhibits a similar dependence on pulse duration. Additionally, we identified CEP-specific trends in harmonic yield: it increases as $\tau^{5/4}$ for $\phi_0=0^\circ$ and decreases as $\tau^{-4.1}$ for $\phi_0= -90^\circ$. Although sub-cycle pulses can generate intense isolated attosecond pulses (IAPs), they also tend to produce higher attochirp and reduced cutoff energies. However, effective compensation for attochirp can mitigate these drawbacks, thereby increasing the capability of sub-cycle pulses to generate short-duration, high-intensity IAPs. These results offer valuable insights into HHG using sub-cycle pulses and have important implications for the advancement of ultrafast light sources and the understanding of ultrafast phenomena at the attosecond timescale.