Abstract
This paper demonstrates how dark pulses may be decelerating in a photorefractive crystal at room temperature. The authors show the conditions that allow to achieve delay larger than the input dark pulse width. When the input pulse duration is close to the crystal response time, the fractional delay is close to unity.
Highlights
Slow light in dispersive nonlinear media was actively studied theoretically and experimentally [1,2,3,4,5], including in photorefractive (PR) materials [6,7,8,9,10,11]
Slowdown of Gaussian “dark pulses” in photorefractive crystal using a two-wave mixing method is shown at room temperature
The two-wave mixing (TWM) process in PR crystal yields amplification of the output pulse during the recording of the photorefractive grating. This modifies the light dispersion inside the crystal, reducing the group velocity of the output amplified pulse down to 1 cm/s in BaTiO3 [12] and Sn2P2S6 [10] at room temperature
Summary
Slow light in dispersive nonlinear media was actively studied theoretically and experimentally [1,2,3,4,5], including in photorefractive (PR) materials [6,7,8,9,10,11]. In agreement with our theoretical model, the experiment shows the dependence of the dark pulse delay and the group velocity values on the photorefractive gain and the input pulse width t0.
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