Laguerre fields strength and beam waist-dependent superluminal propagation of light pulse in atomic medium
Quantum Optics and Quantum Information Research Group, Department of Physics, University of Malakand, Chakdara Dir(L), Khyber Pakhtunkhwa, Pakistan
2 Department of Physics, Hazara University Mansehra, Mansehra, Pakistan
3 Glasgow College, University of Electronic Science and Technology of China, Chengdu, China
4 Department of Basic Sciences, College Preparatory Year, University of Ha’il, 2440, Ha’il, Kingdom of Saudi Arabia
5 Bio Physics Department, Faculty of Science, Cairo University, Giza, Egypt
6 Department of Physics, Abdul Wali Khan University Mardan, Mardan, Pakistan
Accepted: 14 July 2022
Published online: 26 August 2022
We address the superluminal propagation of light in a four-level atomic medium. The superluminal propagation of the probe field is controlled and modified by the strength and waists of control driving fields. Around the origin of Laguerre coordinates in the x, y plane, localized depth of absorption and localized peaks of dispersion are noticed. The localized depth of absorption and dispersion can be narrowed and broadened by changing the beam waist. Increasing the beam waist, we observed broadening in the width of localized absorption and dispersion. Negative group index from to and negative group velocity from to c are observed at the low beam waist. At high beam waist, group index and group velocity remain the same which shows superluminal behaviour in this region. The modified results show potential applications in gravitational wave detection, soliton radar system and speeding up computer processing.
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