High-order harmonic generation triggered by elliptically polarized laser pulses

Project Information

EPHHG

Grant agreement ID: 101154681

DOI

10.3030/101154681

Project terminated on 7 May 2025

EC signature date 2 May 2024

Start date 1 June 2024

End date 31 May 2026

Funded under

• Marie Skłodowska-Curie Actions (MSCA)

Total cost

No data

EU contribution

€ 195 914,88

Coordinated by

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
France

Periodic Reporting for period 1 - EPHHG (High-order harmonic generation triggered by elliptically polarized laser pulses)

Reporting period: 2024-06-01 to 2026-05-31

Summary of the context and overall objectives of the project

High-order harmonic generation (HHG) is a highly nonlinear phenomenon arising from the propagation of a laser pulse throughout a medium. HHG is used to generate tabletop sources of attosecond light pulses, essential for probing ultrafast phenomena in matter at the natural scales of the electrons. The shape of the generated light pulses can be changed by changing the intensity or the frequency of the incident light. However, these parameters cannot be continuously changed in experiments, in contrast to the ellipticity which is moreover simple to adjust and acts as a control knob. While polarization of the incident light is very promising for controlling the shape of the generated attosecond light pulses, up to date, HHG is limited to a narrow range of ellipticities only. The project EPHHG aims to control continuously the shape of generated attosecond light pulses from incident elliptically polarized lights in the full range of laser ellipticities. I propose a theoretical and numerical investigation adapted for this purpose. It includes the development of both theoretical models and sophisticated numerical methods in order to simulate and understand the self-consistent light-matter interactions occurring during light propagation.

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

We have derived equations for the USFA (Unified Strong Field Approximation).
We have developped an optimized version of our code to solve the Time Dependant Schrödinger Equation for 2 degrees of freedom of any laser polarization.

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

We did not havae time to exploit the equations and the code we have obtained during the period of the MCSA EPHHG project.