Group velocity control in the ultraviolet domain via interacting dark-state resonances
نویسندگان
چکیده
The propagation of a weak probe field in a laser-driven four-level atomic system is investigated. We choose mercury as our model system, where the probe transition is in the ultraviolet region. A high-resolution peak appears in the optical spectra due to the presence of interacting dark resonances. We show that this narrow peak leads to superluminal light propagation with strong absorption, and thus by itself is only of limited interest. But if in addition a weak incoherent pump field is applied to the probe transition, then the peak structure can be changed such that both suband superluminal light propagation or a negative group velocity can be achieved without absorption, controlled by the incoherent pumping strength. Group velocity control in the ultraviolet domain via interacting dark-state resonances 2
منابع مشابه
Dark Resonances From Optical Pumping to Cold Atoms and Molecules
Coherent Population Trapping (CPT) is a very beautiful example of quantum interference effect. It was discovered in 1976 in the group of Adriano Gozzini in Pisa [1]. “ Dark resonances” were observed in optical pumping experiments and subsequently interpreted as a quenching of fluorescence due to a destructive interference between two absorption amplitudes connecting two ground state sublevels g...
متن کاملDetermination of BKW Equation of State Parameters via Measurement of the Detonation Velocity in Condensed Explosives
An optical system has been redesigned and used to measure detonation velocity as a function of condensed explosive density for RDX, HMX, PETN. These measurements are then used to determine and fine tune parameters appearing in the BKW (Beker-Kistiakowsky-Wilson) equation of state for gases at extremely high pressures. Steady state form of conservation equations along with the BKW state equation...
متن کاملDetermination of BKW Equation of State Parameters via Measurement of the Detonation Velocity in Condensed Explosives
An optical system has been redesigned and used to measure detonation velocity as a function of condensed explosive density for RDX, HMX, PETN. These measurements are then used to determine and fine tune parameters appearing in the BKW (Beker-Kistiakowsky-Wilson) equation of state for gases at extremely high pressures. Steady state form of conservation equations along with the BKW state equation...
متن کاملTime-dependent analysis of few-photon coherent control schemes
We investigate the coherent control of nonresonant two-photon excitation and (2 + 1) photon ionization processes from the time-dependent perspective. To this end, we have solved the time-dependent Schrödinger equation for a hydrogen atom interacting with an ultraviolet laser field. Results are obtained for symmetric and antisymmetric phase distributions leading to dark and bright pulses, for wh...
متن کاملThe effects of lettuce extract on the level of T4, memory and nerve conduction velocity in male rats
Objective: According to the traditional medicine,lettuce can affect nerve conduction velocity and memory. So, to investigate the effect of lettuce seeds extract on body activities, lettuce seeds were used. Materials and Methods: In the present study, the effects of lettuce (Lactuca sativa) seeds extract consumption (in drinking water) on T4 level...
متن کامل