SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 43: Semiconductor lasers II
HL 43.3: Vortrag
Donnerstag, 30. März 2023, 15:45–16:00, JAN 0027
Optical and quantum optical studies of feedback induced chaotic emission in bimodal VCSELs — •Aris Koulas-Simos, Timo Willburger, Niels Herrmeier, Ching-Wen Shih, Imad Limame, James Lott, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany
Vertical Cavity Surface Emitting Lasers (VCSELs) have proven to be a key building block for commercial applications in data communication, automotive systems and sensing as well as for novel complex neuromorphic photonic platforms. Here, we report on signatures of chaotic emission in bimodal GaAs-based quantum well VCSELs subject to delayed optical feedback. In excitation power-dependent microelectroluminescence studies, a clear lasing transition is evident for the strong mode reflected in the strong s-shape form of the I/O-curve accompanied by an abrupt linewidth narrowing, in contrast to the weak mode which exhibits intensity saturation and rollover at high injection currents. In power-dependent photon autocorrelation measurements, super thermal bunching is observed with g(2)(0) reaching values of 3. Revival peaks with a period equal to the round trip time of the external cavity emerge, indicating that the chaotic emission is induced from the optical feedback. This is further validated from signatures of chaotic emission, directly observed in single-shot intensity measurements with a streak camera.