Coherent control of photon-dressed fringes by attosecond transient absorption

Qianyu Qiu; Guangru Bai; Qian Zhang; Zengxiu Zhao

doi:10.1117/12.3015142

29 December 2023 Coherent control of photon-dressed fringes by attosecond transient absorption

Qianyu Qiu, Guangru Bai, Qian Zhang, Zengxiu Zhao

Proceedings Volume 12975, 6th Optics Young Scientist Summit (OYSS 2023); 129750E (2023) https://doi.org/10.1117/12.3015142
Event: 6th Optics Young Scientist Summit, 2023, Changsha, China

Abstract

Line shapes observed in attosecond transient absorption spectra (ATAS) encode information on the phase of the optical dipole response. Understanding and controlling the phase evolution of interference fringes is among the fundamental goals of exploring coherent interaction. Here, we simulate the attosecond transient absorption in the near-infrared (NIR) dressing field by considering a three-level model in the adiabatic approximation. We find that the absorption line shape can be changed from Lorentzian to Fano to inverted Lorentzian and back again at two-photon dressed energy levels “ω ± 2ω_ι”, and line shapes evolve in half-cycle periodicity (T/2). Moreover, the direction of phase evolution of “ω ± 2ω_ι” is opposite, while the phases of “ω ± 2ω_ι” are roughly the same at certain delays with an interval of approximately a quarter-cycle periodicity (T/4). These results demonstrate that absorbance of two-photon dressed energy levels “ω ± 2ω_ι” can qualitatively map the AC Stark shift. These observations provide new insights into the control of spectral line shapes and open the way for the modulation of quantum optical interference in the laser-driven atom.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Qianyu Qiu, Guangru Bai, Qian Zhang, and Zengxiu Zhao "Coherent control of photon-dressed fringes by attosecond transient absorption", Proc. SPIE 12975, 6th Optics Young Scientist Summit (OYSS 2023), 129750E (29 December 2023); https://doi.org/10.1117/12.3015142

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