Improved slow light performances using photorefractive two-wave mixing

Nacera Bouldja (1) , Marc Sciamanna (1) , Delphine Wolfersberger (1)

1 Chaire Photonique

We experimentally observe an ultralow effective group velocity of 0.9 cm/s of light pulses using the two-wave mixing process in an Sn2P2S6 (SPS):Te crystal at a visible wavelength. The time delay can be controlled through the nonlinear photorefractive gain and the input pulse duration. By optimizing the nonlinearity strength, we achieve a maximum fractional delay of 0.79 for a pulse duration of 100 ms. Our photorefractive slow light system allows combining low group velocity with large delay-bandwidth product for pulse durations spanning three orders of magnitude.

Domaines: Optique [physics.optics]

Nacera Bouldja, Marc Sciamanna, Delphine Wolfersberger. Improved slow light performances using photorefractive two-wave mixing. Optics Letters, 2019, 44 (6), pp.1496. ⟨10.1364/OL.44.001496⟩. ⟨hal-03223365⟩