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A: Fachverband Atomphysik
A 22: Poster – Attosecond Physics (joint session A/MO)
A 22.1: Poster
Mittwoch, 4. März 2026, 17:00–19:00, Philo 1. OG
New 1D atomic model potential for more accurate high-order-harmonic-generation spectra — •Krisztina Sallai1,2, Szabolcs Hack1,2, Szilárd Majorosi1, and Attila Czirják1,2 — 1The Extreme Light Infrastructure ERIC | ALPS Facility, Szeged, H-6728, Hungary — 2University of Szeged, Szeged, H-6720, Hungary
Building on the favourable properties of previously used one-dimensional (1D) atomic model potentials, we introduced a new 1D Gaussian-windowed atomic model potential in [1] for simulating the quantum dynamics of a single active electron atom driven by a strong, linearly polarized near-infrared laser pulse. This new model potential upgraded the accuracy of 1D numerical simulations for single-atom high-order-harmonic-generation (HHG) spectra under commonly used driving laser pulse parameters. By combining two model potentials, we define the Gaussian windowed soft-core Coulomb (GSC) potential (with a =2.551 and b = 2) as
VGSC1D(z) = VSC1D(z) exp(−(z/a)2) +VMSC1D(z)(1 − exp(−(z/b)2)).
The GSC potential offers an outstanding balance of accuracy and computational efficiency, enabling TDSE simulations that generate reliable HHG spectra within minutes in the 1.26 × 1014 − 6.88 × 1014 W/cm2 peak intensity range. Our research suggests that the GSC potential performs best when the Keldysh parameter is within 0.45 ≤γ≤ 1 and the 1D ground state population loss simulated with the GSC potential, is not greater than 0.6 at the end of the laser pulse, which is well in line with most GHHG methods.
References: [1] K Sallai et al., Phys. Rev. A 110, 063117 (2024)
Keywords: HHG; high-order-harmonic-generation; atomic response; quantum dynamics; atomic model potential