THUNDER4D

Transverse-resolved Herriott-cell UPPE solver for Nonlinear Dynamics close to Experimental Reality, 4D: a 4D (x, y, z, t) UPPE solver for multipass cells.

THUNDER4D simulates the nonlinear propagation of ultrashort pulses through gas-filled multipass cells (MPCs), in 4D: the field \(A(x, y, t)\) is propagated along \(z\) with no symmetry assumed, so clipped, aberrated or mismatched beams, spatial chirp and spatio-spectral homogeneity are all resolved. A design helper proposes a cell for a given laser, and a graphical interface runs everything without scripts.

import thunder4d as th

cfg = th.default_input(
    laser={"energy_J": 1e-3, "duration_fs": 200},
    medium={"gas": "Ar", "pressure_bar": 0.7},
    cell={"roc_m": 0.6, "separation_m": 1.183, "n_passes": 26},
    grid={"lambda_min_nm": 900, "lambda_max_nm": 1180},
)
b = th.run_input(cfg)          # 26 passes, a few seconds on a laptop

Start with the Quickstart. The code is checked against published experiments in the benchmarks.

_images/clipped_far_field_log.png — Fig. 1 Collimated-beam profiles of a Gaussian beam clipped by a knife edge, at selected passes and wavelengths. The colours generated by self-phase modulation carry one to two orders of magnitude less edge diffraction than the fundamental.