Angular momentum distribution in Rydberg states excited by a strong laser pulse

Venzke, Joel; Reiff, Ran; Xue, Zetong; Jaron-Becker, A.

doi:10.1103/physreva.98.043434

Cited by 7 publications

(5 citation statements)

References 41 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 3(c) shows the sum of the excitation probability over all odd and even l states. At low intensity, the parity effect is observed for both CEPs with excitation to odd (even) l occurring when an even (odd) number of photons are absorbed, consistent with the expectation from the MP model [32,40].…”

supporting

confidence: 83%

“…The population is spread across a range of quantum states with odd and even l's populated in each n-photon absorption channel. Venzke et al [40] previously showed that the parity effect can break down with few-cycle pulses, where it was proposed to be a consequence of the bandwidth of the pulse. However, here we show that parity is observed in the low-intensity regime but depends on the CEP at higher intensities.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Carrier-Envelope-Phase Dependent Strong-Field Excitation

Chetty,

Glover,

Tong

et al. 2021

Preprint

View full text Add to dashboard Cite

We present a joint experimental-theoretical study on the effect of the carrier-envelope phase (CEP) of a few-cycle pulse on the atomic excitation process. We focus on the excitation rates of argon as a function of CEP in the intensity range from 50−300 TW/cm 2 , which covers the transition between the multiphoton and tunneling regimes. Through numerical simulations based on solving the timedependent Schrödinger equation (TDSE), we show that the resulting bound-state population is highly sensitive to both the intensity and the CEP. Because the intensity varies over the interaction region, the CEP effect is considerably reduced in the experiment. Nevertheless, the data clearly agree with the theoretical prediction, and the results encourage the use of precisely tailored laser fields to coherently control the strong-field excitation process. We find a markedly different behavior for the CEP-dependent bound-state population at low and high intensities with a clear boundary, which we attribute to the transition from the multiphoton to the tunneling regime.

show abstract

supporting

confidence: 83%

mentioning

confidence: 99%

Carrier-Envelope-Phase Dependent Strong-Field Excitation

Chetty,

Glover,

Tong

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The wavefunction is propagated in time using the Crank-Nicolson method with a time step of 0.01 a.u. In test calculations the numerical code was compared against results from a previously used 2D cylindrical code [22], results from time-dependent perturbation theory in the appropriate intensity and frequency regimes, as well as results reported in the literature [23]. Quantitative agreement was achieved.…”

Section: Numerical Solution Of Time-dependent Schrödinger Equationmentioning

confidence: 99%

Ionization of helium by an ultrashort extreme-ultraviolet laser pulse

Venzke¹,

Jaroń-Becker²,

Becker³

2020

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

We theoretically study photoelectron angular distributions and related anisotropy parameters for the competition of one- and two-photon ionization of He in an ultrashort extreme-ultraviolet laser pulse, using numerical results from the time-dependent Schrödinger equation. We explore the transition between the two processes for variation of the pulse duration, peak intensity, and central frequency or photoelectron energy. In the results obtained for fixed pulse parameters the transition and interference between the processes can be observed in the even (β2, β4) and odd (β1, β3) parameters, respectively, while the onset of the impact of three-photon ionization is observed via β5 at high peak intensities. Finally, we show that the transition can be observed via the even anisotropy parameters in pulses without carrier-to-envelope stabilization as well as in free-electron laser pulses with fluctuating pulse shape.

show abstract

“…强场RSE过程形成的里德伯态的量子态分布最近几年也引起了研究者的关注, 这部分工作主要集中在理论研究上. Eichmann等 [80] 计算得到了 800 nm强激光场中He*的主量子数n分布, 同时, 他们通过计算主量子数为n的里德伯态的激发概率和存活概率, 指出n > 15的态几乎不受强场的…”

Section: 原子强场Rse的量子态分布unclassified

Rydberg state excitation of atoms and molecules in ultrafast intense laser field

Shen¹,

Liu²,

Chen³

et al. 2022

Acta Phys. Sin.

View full text Add to dashboard Cite

When atoms or molecules are irradiated by a strong laser field with pulse duration of tens of femtoseconds and intensity larger than 10<sup>13</sup>W/cm<sup>2</sup>, they will generally undergo tunneling ionization, which will induce various non perturbative and highly nonlinear phenomena. Investigations on the strong field physical processes is of value to research fields including attosecond physics, molecular orbital imaging, ultrafast electron diffraction and advanced short ultraviolet light sources. While there is a relatively long history on the studies of tunneling ionization induced physics including high-order above threshold ionization (HATI), high-order harmonic generation (HHG) and non-sequential double ionization (NSDI), it is until more recently to surprisedly find that in the tunneling ionization region, neutral atoms or molecules can survive in strong laser fields in highly excited Rydberg states. Being a basic process of the interaction between ultrafast strong laser fields and atoms or molecules, such Rydberg state excitation (RSE) has been viewed as an important supplement to the physical picture of the tunneling ionization. During the past several years, there has attracted extensive research attention on the RSE process in strong laser fields. Various theoretical and experimental methods have been developed to investigate the strong field RSE of both atoms and molecules, to understand the underlying physical mechanism of recapture of the tunneling electrons and to reveal the quantum features and molecular structure effect in RSE. These advances have provided an in-depth understanding and a systematic view of the atomic and molecular RSE in strong laser fields, as well as its relation to the other tunneling ionization induced physical processes such as ATI, HHG and NSDI. Here, we systematically review recent research progress on the atomic and molecular RSE in strong laser fields. We particularly focus on several aspects of this strong field process, i.e., the understanding of the physical mechanism of the recapture, the quantum feature and the interference of different orbits, the structure effect in molecular RSE. In addition, neutral particle acceleration and coherent radiation which could be induced by the strong field RSE, are also discussed. Finally, we provide a short summary and prospect of the future studies on the strong field RSE.

show abstract

Angular momentum distribution in Rydberg states excited by a strong laser pulse

Cited by 7 publications

References 41 publications

Carrier-Envelope-Phase Dependent Strong-Field Excitation

Carrier-Envelope-Phase Dependent Strong-Field Excitation

Ionization of helium by an ultrashort extreme-ultraviolet laser pulse

Rydberg state excitation of atoms and molecules in ultrafast intense laser field

Contact Info

Product

Resources

About