2026-10-14T06:30:53Z https://www.scidb.cn/oai

10.57760/sciencedb.14058 2023-12-08T09:53:45Z

2023-12-08 Second-Harmonic Generation of High-Intensity Light Waves under the Influence of Cubic Nonlinearity doi:10.57760/sciencedb.14058 en This study examines the implications of cubic nonlinearity on second-harmonic generation (SHG) within high-intensity optical fields, elucidating how cubic nonlinearity inherent to the medium perturbs the ideal phase interrelation among the interacting waves, culminating in diminished energy conversion efficiency and inducing spectrum modulation. A methodology is advanced for identifying the optimal wave vector mismatch that maximizes SHG efficiency while circumventing second-harmonic (SH) pulse modulation. Through simulations of the SHG mechanism, conducted under varying intensities (1-5 TW/cm²) and contrasting durations (10 ns and 50 fs), the research underscores the efficacy of this approach. Notably, an optimal wave vector mismatch scenario facilitated the attainment of an 86% energy conversion efficiency, utilizing a 0.5 mm thick KDP crystal, with the procedure peaking at an intensity of 5 TW/cm² and a pulse duration of 48 fs. Frequency conversion; nonlinear optics; cubic nonlinearity; B-integral; phase mismatch Ziming Sun Fan Wei PUBLIC https://creativecommons.org/licenses/by-nc/4.0/ dataset Science Data Bank