论文标题
chirp和carrier-envelope阶段对非直集高谐波产生的影响
Influence of chirp and carrier-envelope phase on non-integer high-harmonic generation
论文作者
论文摘要
高谐波生成（HHG）是用于探测超快电子动力学的多功能技术。虽然HHG对目标的电子特性敏感，但HHG也取决于激光脉冲的波形。众所周知，当载体信封阶段（CEP）（$φ$）变化时，在高谐波频谱中的（峰值）位置，$ω$可以移动。我们得出描述CEP偏移的相应参数依赖性的公式；特别是，我们对（峰）移动有一个透明的结果，$dΩ/dφ= { - } 2 \ bar {\ mathfrak f}'ω/ω__0$，其中$ω_0$描述了基本频率和$ \ bar {\ mathfrak f}'$表征驾驶驾驶laster laster pulse的chirp。我们将分析公式与成熟的数值模拟进行比较，发现$dΩ/dφ$中的平均相对绝对偏差仅17％。我们的分析结果与实验观察完全一致。
High harmonic generation (HHG) is a versatile technique for probing ultrafast electron dynamics. While HHG is sensitive to the electronic properties of the target, HHG also depends on the waveform of the laser pulse. As is well known, (peak) positions, $ω$, in the high-harmonic spectrum can shift when the carrier envelope phase (CEP), $φ$ is varied. We derive formulae describing the corresponding parametric dependencies of CEP shifts; in particular, we have a transparent result for the (peak) shift, $dω/dφ= {-} 2 \bar{\mathfrak f}' ω/ω_0$, where $ω_0$ describes the fundamental frequency and $\bar{\mathfrak f}'$ characterizes the chirp of the driving laser pulse. We compare the analytical formula to full-fledged numerical simulations finding only 17 % average relative absolute deviation in $dω/dφ$. Our analytical result is fully consistent with experimental observations.
