Carrier envelope phase effect on the spatial distribution of high-order harmonic generation in asymmetric molecule

Zhang Jun, Liu Hai-Feng, Pan Xue-Fei, Du Hui, Guo Jing, Liu Xue-Shen^†,

(a) Molecular geometry model of HeH²⁺. (b) The linearly polarized few-cycle laser pulse and (c) high-order harmonic spectrum of HeH²⁺ at different CEPs, where four representative (ϕ = 0, ϕ = 0.25π, ϕ = 0.75π and ϕ = π) CEPs are given. The peak intensity of the laser pulse is I = 5 × 10¹⁵ W/cm², and the pulse duration is 4 fs.