Spectral phase effects in above threshold ionization
Spectral phase effects in above threshold ionization
复制标题
高于阈值电离的光谱相位效应
DOI：
10.1088/1361-6455/acc49e
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Harris, A L
中科院分区：
文献类型：
--
作者：
Harris, A L
我们提出了使用雕刻激光脉冲的阈值以上电离（ATI）的理论研究。求解了随时间变化的Schrödinger方程来计算ATI的能量和动量谱，并利用简单的man模型和求解牛顿运动方程的经典模型对电子电离后的运动进行了定性理解。给出了高斯和艾里激光脉冲功率谱相同，但谱相不同的结果。模拟结果表明，艾里脉冲的三阶谱相位会改变电场的时间包络，从而改变电离时间和重散射过程的动力学。具体来说，在ATI过程中使用艾里脉冲会导致Keldysh平台截止点向较低能量移动，这是由于激光场中电子的重动力能量降低，并且艾里激光脉冲的侧叶改变了重散射事件的数量和时间。这转化为高阶ATI平台和周期内和周期间干扰特征的变化。我们的研究结果还表明，具有相同载波包络相位和几乎相同包络相位的激光脉冲产生不同的光电子动量分布，这是脉冲光谱相位的直接结果。
We present theoretical studies of above threshold ionization (ATI) using sculpted laser pulses. The time-dependent Schrödinger equation is solved to calculate the ATI energy and momentum spectra, and a qualitative understanding of the electron motion after ionization is explored using the simple man's model and 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, and the side lobes of the Airy laser pulse change the number and timing of rescattering events. This translates into changes to the high-order ATI plateau and intra-and intercycle interference features. Our results also show that laser pulses with identical carrier envelope phases and nearly identical envelopes yield different photoelectron momentum distributions, which are a direct result of the pulse's spectral phase.
影响因子：
8.6
作者：
Ray, D.;Ulrich, B.;Cocke, C. L.
通讯作者：
Cocke, C. L.