Amplification without inversion, fast light and optical bistability in a duplicated two-level system
arXiv:1310.5204 · doi:10.1016/j.jlumin.2014.01.068
Abstract
The optical properties of a weak probe field in a duplicated two-level system are investigated in multiphoton resonance (MPR) condition and beyond it. It is shown that, by changing the relative phase of applied fields, the absorption switches to the amplification without inversion in MPR condition. By applying the Floquet decomposition to the equation of motion beyond MPR condition, it is shown that the phase-dependent behavior is valid only in MPR condition. Moreover, it is demonstrated that the group velocity of light pulse can be controlled by the intensity of applied fields and the gain-assisted superluminal light propagation (fast light) is obtained in this system. In addition, the optical bistability (OB) behavior of the system is studied beyond MPR condition. We apply an indirect incoherent pumping field to the system and it is found that the group velocity and OB behavior of the system can be controlled by incoherent pumping rate.
References in corpus (4)
- Light propagation through closed-loop atomic media beyond the multiphoton resonance condition
- Effect of quantum interference on the optical properties of a three-level V-type atomic system beyond the two-photon resonance condition
- Slowing light through Zeeman Coherence Oscillations in a duplicated two-level system
- Phase control of spatial interference from two duplicated two-level atoms