Slow-down of the light velocity has potential applications in information processing  and interferometers. Recently, several works have experimentally  demonstrated the deceleration of light in photorefractive crystals using a two wave mixing (TWM). A low velocity value of the order of 0.02 cm/s has been reported in BaTiO3 crystal for Gaussian pulse profiles of long duration of 1.3 s . It was also reported that the time delay depends mainly on the coupling photorefractive gain. However, the photorefractive grating build-up time in that crystal does not allow to slow down pulses shorter than ms, which limits its interest for telecoms applications.
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