Programme

I.1 -- Invited, VCTP-50

Date: Monday, 4 August 2025

Time: 09:20 - 10:00

Manifestation of laser-target symmetry breaking in high-harmonic generation: from frequency shift to odd-even intensity modulation

Doan-An Trieu

(1) Duy Tan University, Ho Chi Minh City, Vietnam; (2) Ho Chi Minh City University of Education, Ho Chi Minh City, Vietnam;

Although frequency shift and odd-even intensity modulation in high-order harmonic generation (HHG) have both been observed for asymmetric laser-target systems, they are typically studied as two separate effects. In this presentation, two investigations on the odd-even harmonics generation [1] and frequency shift [2] induced by a static electric field are reported, coming up with a general theory for unifying the two phenomena through a common origin and clarifying the controlling factor [3]. The theory is represented by a simple analytical model, and its generality is supported by numerical simulations with various asymmetric factors. Recognizing how asymmetry affects HHG helps us better understand the properties of the target material and supports applications such as mapping molecular dynamics or detecting subtle external fields. [1] Doan-An Trieu et al., Phys. Rev. A 108, 023109 (2023) [2] Doan-An Trieu et al., Phys. Rev. A 110, L021101 (2024) [3] Doan-An Trieu et al., Phys. Rev. A 110, L041101 (2024)

Presenter: Trieu Doan An