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We show how the velocity of an optical pulse propagating through a dispersive medium depends on the pulse duration. A transition from the group velocity for long pulses to the in-vacuum velocity for short pulses is shown both in experimental results and in theoretical predictions. The temporal duration of the experimental pulses are 150ps and 3.5ns. A description of the pulse propagation in terms...
Optical sensors have been extensively studied in order to develop new methods of investigation for different materials. In particular, light scattering and absorption in biological tissues have been investigated for diagnostic and therapeutic applications. Here we present an experimental work devoted to develop a new kind of optical sensor based on the random laser emission. Such an optical phenomenon...
The random laser has represented an important topic in photonics and an opportunity to develop new potential practical applications. Our work, both experimental and theoretical, has been devoted to characterize, understand and control the emission in random laser systems in weakly scattering media. Three statistical regimes of the emission spectrum have been detected, besides modifications in the...
We present an experimental and theoretical investigation, performed on hot sodium atoms in a ladder scheme, showing the control of the absorption and of the propagation velocity of a probe light pulse with a spectral bandwidth as large as 1.8GHz. The predictions of the theoretical model compare favorably with the experimental results.
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