# Holographic interferences in strong-field ionization beyond the dipole approximation: The influence of the peak and focal volume averaged laser intensity

## TL;DR

This paper investigates how magnetic field effects beyond the electric dipole approximation influence holographic interference patterns in strong-field ionization, using experiments and quantum simulations to analyze asymmetries and derive scaling laws.

## Contribution

It introduces a detailed analysis of nondipole effects on holographic interference patterns and establishes a connection between interference features and laser intensities, including peak intensity measurement.

## Key findings

- Magnetic field effects cause asymmetry in holographic interference patterns.
- Scaling laws relate interference features to focal and peak laser intensities.
- Experimental and simulation results agree on nondipole signatures in electron momentum distributions.

## Abstract

In strong-field ionization interferences between electron trajectories create a variety of interference structures in the final momentum distributions. Among them, the interferences between electron pathways that are driven directly to the detector and the ones that rescatter significantly with the parent ion lead to holography-type interference patterns that received great attention in recent years. In this work, we study the influence of the magnetic field component onto the holographic interference pattern, an effect beyond the electric dipole approximation, in experiment and theory. The experimentally observed nondipole signatures are analyzed via quantum trajectory Monte Carlo simulations. We provide explanations for the experimentally demonstrated asymmetry in the holographic interference pattern and its non-uniform photoelectron energy dependence as well as for the variation of the topology of the holography-type interference pattern along the laser field direction. Analytical scaling laws of the interference features are derived, and their direct relation to either the focal volume averaged laser intensities, or to the peak intensities are identified. The latter, in particular, provides a direct access to the peak intensity in the focal volume.