We introduce soft recollisions in laser-matter interaction. They are characterized by the electron missing the ion upon recollision in contrast with the well-known head-on collisions responsible for high-harmonic generation or above-threshold ionization. We demonstrate analytically that soft recollisions can cause a bunching of photoelectron energies through which a series of low-energy peaks emerges in the electron yield along the laser polarization axis. This peak sequence is universal, it does not depend on the binding potential, and is found below an excess energy of one tenth of the ponderomotive energy.

Download full-text PDF

Source
http://dx.doi.org/10.1103/PhysRevLett.108.033201DOI Listing

Publication Analysis

Top Keywords

soft recollisions
12
electron-energy bunching
4
bunching laser-driven
4
laser-driven soft
4
recollisions introduce
4
introduce soft
4
recollisions laser-matter
4
laser-matter interaction
4
interaction characterized
4
characterized electron
4

Similar Publications

Electron correlation in nonsequential double ionization (NSDI) of molecules by counter-rotating two-color circularly polarized (TCCP) fields is investigated with a three-dimensional classical ensemble model. Numerical results indicate that the two electrons from NSDI of molecules in counter-rotating TCCP fields show strong angular correlation and the angular correlation behavior sensitively depends on the internuclear distance. With the internuclear distance increasing, the dominant behavior of electron pairs evolves from correlation to anti-correlation.

View Article and Find Full Text PDF

Femtosecond Single Cycle Pulses Enhanced the Efficiency of High Order Harmonic Generation.

Micromachines (Basel)

May 2021

Department of Physics and Technology, University of Bergen, Allegt. 55, N-5007 Bergen, Norway.

High-order harmonic generation is a nonlinear process that converts the gained energy during light-matter interaction into high-frequency radiation, thus resulting in the generation of coherent attosecond pulses in the XUV and soft x-ray regions. Here, we propose a control scheme for enhancing the efficiency of HHG process induced by an intense near-infrared (NIR) multi-cycle laser pulse. The scheme is based on introducing an infrared (IR) single-cycle pulse and exploiting its characteristic feature that manifests by a non-zero displacement effect to generate high-photon energy.

View Article and Find Full Text PDF

Non-sequential double ionization with near-single cycle laser pulses.

Sci Rep

August 2017

Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, United Kingdom.

A three-dimensional semiclassical model is used to study double ionization of Ar when driven by a near-infrared and near-single-cycle laser pulse for intensities ranging from 0.85 × 10 W/cm to 5 × 10 W/cm. Asymmetry parameters, distributions of the sum of the two electron momentum components along the direction of the polarization of the laser field and correlated electron momenta are computed as a function of the intensity and of the carrier envelope phase.

View Article and Find Full Text PDF

Laser-Driven Recollisions under the Coulomb Barrier.

Phys Rev Lett

December 2016

Institut für Physik, Universität Rostock, 18051 Rostock, Germany.

Photoelectron spectra obtained from the ab initio solution of the time-dependent Schrödinger equation can be in striking disagreement with predictions by the strong-field approximation (SFA), not only at low energy but also around twice the ponderomotive energy where the transition from the direct to the rescattered electrons is expected. In fact, the relative enhancement of the ionization probability compared to the SFA in this regime can be several orders of magnitude. We show for which laser and target parameters such an enhancement occurs and for which the SFA prediction is qualitatively good.

View Article and Find Full Text PDF

We present a semi-classical study of the effects of the Lorentz force on electrons during high harmonic generation in the soft and hard X-ray regions driven by near- and mid-infrared lasers with wavelengths from 0.8 to 20 μm, and at intensities below 10 W/cm. The transverse extent of the longitudinal Lorentz drift is compared for both Gaussian focus and waveguide geometries.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!