2026-10-15T01:02:54Z https://www.scidb.cn/oai

10.57760/sciencedb.25003 2025-05-15T09:06:15Z

2025-05-15 Bragg microcavities created by the collision of half-cycle Gaussian and rectangular attosecond light pulses in a time-dependent resonant medium doi:10.57760/sciencedb.25003 en This paper examines the behavior of dynamic microcavities (DM) in multi-level resonant media when attosecond unipolar pulses of different shapes (Gaussian and rectangular) collide, acting as 2π-like selfinduced transparency pulses. In the case of realistic quasi-unipolar pulses, the influence of the opposite polarity trailing edge is investigated, and conditions under which the trailing edge’s effect can be ignored are found analytically and then confirmed by a direct numerical calculation. We demonstrate that the collision of sub-cycle pulses in a medium results in a rapid change of the refractive index both in time and space. Thus, the resonant medium under the action of a sequence of pulses considered here is an example of a time-dependent medium. The findings demonstrate the feasibility of creating time-dependent media in an atomic medium with high polarization relaxation times T2, and subsequently controlling them with half-cycle pulses at an extremely short timescale of half of an electromagnetic field oscillation. dynamic microcavities; attosecond light pulses; perturbation theory ROSTISLAV ARKHIPOV OLGA DIACHKOVA MIKHAIL ARKHIPOV IVAN KISLYAKOV JUN WANG NIKOLAY ROSANOV RESTRICTED dataset Science Data Bank