Bouchez Guillaume, Uy Chi-Hak, Macias Brice, Wolfersberger Delphine, Sciamanna Marc
Opt Lett. 2019 Feb 15;44(4):975-978. doi: 10.1364/OL.44.000975.
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 BaTiO photorefractive crystal. We demonstrate that the chaos bandwidth first increases linearly with feedback ratio but then saturates to relatively high values. With a single optical feedback, a chaos bandwidth up to about 18 GHz is achieved, which is about five times as large as 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.
我们通过实验和理论分析了受相位共轭反馈作用的激光二极管所产生的混沌动力学。相位共轭是由BaTiO光折变晶体中的四波混频获得的。我们证明，混沌带宽首先随反馈比线性增加，但随后会饱和到相对较高的值。通过单光反馈，可实现高达约18 GHz的混沌带宽，这大约是自由运行激光二极管弛豫振荡频率的五倍。数值模拟证实了我们的实验观察结果，并揭示了对晶体的有限深度穿透是观察到的饱和现象的原因。
