Abstract. Polarisation properties of the superfluorescence in the near-infrared regime have been investigated between high-lying levels of Sr and Ba under the influence of a static homogeneous external magnetic field. In some transitions the time-resolved measurements show a change of the polarisation of the superfluorescence depending on the magnetic field strenght. In suitable experimental conditions intensity modulations were observed. These were assigned as Zeeman quantum beats or indirectly observed Zeeman superfluorescent beats. The experimental findings of superfluorescence in two-level, three-level, or multi-level configurations in dependence on the magnetic field strength can be explained well in a semiclassical model of multi-level superfluorescence.
Collective emission in a resonant cavity was observed between high-lying levels in Sr and Ba. These transitions react very sensitively to a static external electric field. The square root of the maximum of the intensity of the superfluorescent pulse decreases linearly with the second power of the electric field strength. The behavior of the maximum of the intensity, of the characteristic superfluorescent time, and of the delay time of the superfluorescent pulse was described in the framework of modified Maxwell-Bloch equations and explained by a change of the characteristic time constant of the superfluorescent pulse.PACS number(s): 32.60.+i, 32.90.+a, 42.50.Fx
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