Abstract
By performing two-wave mixing experiments in a liquid crystal light valve we obtain slow and fast-light effects with a deceleration of light pulses down to group velocities as small as a few tenths of mm/s. The wave-mixing process is characterized by the presence of multiple-order output beams, each experiencing a different group delay. On each output order, the group delay can be controlled by changing the frequency detuning between the pump and probe as well as by varying the external voltage applied to the light-valve. The large group delay provided by the beam coupling in the light-valve corresponds to a large group index, which, on the other hand, is associated to a narrow frequency bandwidth of the two-wave-mixing gain. These properties can be used to realize applications in high precision interferometry and adaptive holography, with systems that allows the detection of subpicometer displacements.
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