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arXiv · 2405.11753

Analytically controlling laser-induced electron phase in sub-cycle motion

Doan-An Trieu·Trong-Thanh D. Nguyen·Thanh-Duy D. Nguyen·Thanh Tran·Van-Hoang Le·Ngoc-Loan Phan
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Abstract

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 Schr\"odinger equation. Moreover, we discuss the benefits of the discovered relation in \textit{in situ} applications, including continuously and precisely tuning XUV waves and developing a new method of comprehensively sampling THz pulse.

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Doan-An Trieu, Trong-Thanh D. Nguyen, Thanh-Duy D. Nguyen, Thanh Tran, Van-Hoang Le, Ngoc-Loan Phan. 2024-05-20. Analytically controlling laser-induced electron phase in sub-cycle motion. https://arxiv.org/abs/2405.11753

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