HarP: a simulation tool for high-order harmonic generation and propagation in gases

@misc{pouyez2026harp,
  title = {{HarP: a simulation tool for high-order harmonic generation and propagation in gases}},
  author = {Mattys Pouyez and Dominika Maslarova and Linus Hagedorn and Patrik Jansson and Robin Weissenbilder and Stefanos Carlström and Anne L'Huillier and Tünde Fülöp},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.35440},
  eprint = {2610.35440},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.35440},
}

TY  - UNPB
TI  - HarP: a simulation tool for high-order harmonic generation and propagation in gases
AU  - Mattys Pouyez
AU  - Dominika Maslarova
AU  - Linus Hagedorn
AU  - Patrik Jansson
AU  - Robin Weissenbilder
AU  - Stefanos Carlström
AU  - Anne L'Huillier
AU  - Tünde Fülöp
PY  - 2026
DA  - 2026/10/26
PB  - arXiv
DO  - 10.48550/arxiv.2610.35440
UR  - https://arxiv.org/abs/2610.35440
AB  - Accurately simulating high-order harmonic generation (HHG) for attosecond science requires connecting the microscopic single-atom quantum dynamics and the macroscopic propagation of intense driving laser fields. HarP is an open-source Python code designed to address this multiscale problem. It solves the wave equations for both the driving laser field and the generated harmonics, using precomputed dipole tables for the nonlinear polarization density. This tabulation enables the direct integration of accurate microscopic models while avoiding costly calculations during the propagation. The methodology builds upon the approach of [L'Huillier et al. (1992) PRA 46, 2778] and has already facilitated multiple studies on phase matching, propagation effects and HHG optimization. This paper presents the underlying physical model, its numerical implementation, and comparison against alternative simulation frameworks.
ER  -