论文标题
高阶高于高阈值电离原子的光谱相效应
Spectral Phase Effects in High-Order Above Threshold Ionization of Noble Gas Atoms
论文作者
论文摘要
我们使用雕刻的激光脉冲来介绍上述阈值电离（ATI）的理论研究。求解时间依赖性的Schroedinger方程来计算ATI能量和动量光谱，并使用解决牛顿运动方程的经典模型探索了电离后对电子运动后的定性理解。对于具有相同功率谱但不同光谱阶段的高斯和通风激光脉冲提出了结果。模拟表明，通风脉冲的三阶光谱阶段可以改变电场的时间包膜，这会导致电离时间和撤销过程的动力学变化。具体而言，在ATI过程中使用通风的脉冲会导致Keldysh高原切口转移到降低能量，这是由于激光场中电子的浮动能量降低。此外，通风激光脉冲的侧叶改变了撤销事件的数量和时机，从而导致高阶ATI高原发生变化。我们的结果还表明，具有相同载体包膜阶段和几乎相同信封的激光脉冲产生不同的光电子动量密度，这是脉冲光谱阶段的直接结果。
We present theoretical studies of above threshold ionization (ATI) using sculpted laser pulses for noble gas atoms. The time-dependent Schroedinger equation is solved to calculate the ATI energy and momentum spectra, and a qualitative understanding of the electron motion after ionization is explored using a classical model that solves Newton's equation of motion. Results are presented for Gaussian and Airy laser pulses with identical power spectra, but differing spectral phases. The simulations show that the third order spectral phase of the Airy pulse, which can alter the temporal envelope of the electric field, causes changes to the timing of ionization and the dynamics of the rescattering process. Specifically, the use of Airy pulses in the ATI process results in a shift of the Keldysh plateau cutoff to lower energy due to a decreased pondermotive energy of the electron in the laser field. Additionally, the side lobes of the Airy laser pulse change the number and timing of rescattering events, which results in changes to the high-order ATI plateau. Our results also show that laser pulses with identical carrier envelope phases and nearly identical envelopes yield different photoelectron momentum densities, which are a direct result of the pulse's spectral phase.
