Besides, this phenomenon is achieved under nearly transparency conditions and with negligible distortion of the propagation pulse. The physical origin of this phenomenon corresponds to a transfer of the atomic coherence from electromagnetically induced transparency to electromagnetically induced absorption. Velocity Girl c (Android, Iphone), Velocity Girl - Sorry Again, Snow Patrol - Velocity Girl, Velocity Girl - Crazy Town, Primal. of photonic crystal is superluminal, that is, the group velocity. In addition we exploit the fact that the properties of the atomic medium can be dramatically modified by controlling the relative phase between moreВ В» the driving field and the squeezed field, allowing us to manipulate the group velocity at which light propagates. 4 with an objective to obtain the pressure, velocity profile of the aortic pulse and. The observed superluminal motion in the jet. We find that by varying the intensity of the squeezed field the group velocity of a weak pulse can change from subluminal to superluminal. The velocity is overestimated and even the (smaller) transverse component may appear to exceed the speed of light. The picture that emerges is that the actual propagation velocity of. We analyze the interplay between the spontaneous generated coherence and the squeezed field on the susceptibility of the atomic system. Three cases of wave propagation involving possible superluminal speeds are discussed. We study the dispersion and absorption spectra of a weak probe in a -type three-level atomic system with closely ground sublevels driven by a strong field and damped by a broadband squeezed vacuum.

Superluminal velocity