Wideband chaos from a laser diode with phase-conjugate feedback

Guillaume Bouchez (1) , Chi-Hak Uy (1) , Brice Macias (1) , Delphine Wolfersberger (1) , Marc Sciamanna (1)

1 Chaire Photonique

We analyze experimentally and theoretically the chaotic dynamics generated by a laser diode subjected to phase-conjugate feedback. Phase-conjugation is obtained from four-wave mixing in a BaT i0 3 photorefractive crystal. We demonstrate that the chaos bandwidth first increases linearly with the feedback ratio but then saturates to relatively high values. A chaos bandwidth up to about 18 GHz is achieved, which is more than five times larger than the free-running laser diode relaxation oscillation frequency. Numerical simulations confirm our experimental observations and unveil that the finite depth penetration into the crystal is responsible for the observed saturation.

Domaines: Dynamique Chaotique [nlin.CD]; Optique [physics.optics]

Guillaume Bouchez, Chi-Hak Uy, Brice Macias, Delphine Wolfersberger, Marc Sciamanna. Wideband chaos from a laser diode with phase-conjugate feedback. Optics Letters, 2019, 44 (4), pp.975. ⟨10.1364/OL.44.000975⟩. ⟨hal-02447460⟩