2020 EJRNL PP T. S. DO ESPIRITO SANTO 1.pdf
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Terbatas Ratnasari
» ITB
Terbatas Ratnasari
» ITB
We study experimentally and theoretically the time-dependent response of a cold atom cloud illuminated by
a laser beam immediately after the light is switched on. We show that cooperative effects, which have been
previously investigated in the decay dynamics after the laser is switched off, also give rise to characteristic
features in this configuration. In particular, we show that collective Rabi oscillations exhibit a superradiant
damping. We first consider an experiment that is performed in the linear-optics regime and is well described
by a linear coupled-dipole theory. We then show that this linear-optics model breaks down when increasing the saturation parameter, and that the experimental results are then well described by a nonlinear mean-field theory.