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Improved slow light performances using photorefractive two-wave mixing

Nacera Bouldja 1 Marc Sciamanna 1 Delphine Wolfersberger 1
1 Chaire Photonique
LMOPS - Laboratoire Matériaux Optiques, Photonique et Systèmes, CentraleSupélec
Abstract : 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.
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Contributor : Delphine Wolfersberger <>
Submitted on : Tuesday, May 11, 2021 - 3:32:41 PM
Last modification on : Tuesday, May 11, 2021 - 3:44:06 PM
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Nacera Bouldja, Marc Sciamanna, Delphine Wolfersberger. Improved slow light performances using photorefractive two-wave mixing. Optics Letters, Optical Society of America - OSA Publishing, 2019, 44 (6), pp.1496. ⟨10.1364/OL.44.001496⟩. ⟨hal-03223365⟩

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