2024/05/20 by Doan-An Trieu, Trieu, Doan-An, Trong-Thanh D. Nguyen +9 · 1 citation
Engineering · Physics and Astronomy · #FOS: Physical sciences #Laser Design and Applications #Laser-Matter Interactions and Applications #Optics (physics.optics) #Photocathodes and Microchannel Plates #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2405.11753
openalex publication_date 2024/05/20 · openalex created_date 2024/05/22 · openalex updated_date 2026/07/28
Precise control of the electron phase accumulated during its sub-cycle motion within intense laser fields is essential in strong-field physics, yet remains mostly indirect and complicated so far. In this Letter, we develop a novel approach to control this sub-cycle electron phase by tuning a low-frequency electric field applied on a centrosymmetric gaseous target during its interaction with a few-cycle infrared laser pulse. Our method is based on a universal analytical relation between the low-frequency electric field and its induced harmonic frequency shift, derived by the strong-field approximation. This simple relation and its universality are confirmed numerically by directly solving the time-dependent Schrödinger equation. Moreover, we discuss the benefits of the discovered relation in in situ applications, including continuously and precisely tuning XUV waves and developing a new method of comprehensively sampling THz pulse.