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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Zero-lag synchronization and bubbling in delay-coupled lasers.

J Tiana-Alsina¹, K Hicke, X Porte

¹Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Campus de Terrassa, Edif GAIA, Rambla de Sant Nebridi, Terrassa, E-08222 Barcelona, Spain.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|April 3, 2012

Summary

This summary is machine-generated.

Two coupled semiconductor lasers achieve chaos synchronization. This synchronization degrades as pump currents increase, particularly during coherence collapse, linked to bubbling events.

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Area of Science:

Optics and Photonics
Nonlinear Dynamics
Laser Physics

Background:

Semiconductor lasers are crucial for modern optics.
Laser synchronization is key for secure communication and signal processing.
Understanding chaotic dynamics in lasers is essential for controlling their behavior.

Purpose of the Study:

To experimentally investigate chaos synchronization in mutually coupled semiconductor lasers.
To analyze the loss of synchronization as pump currents increase.
To differentiate synchronization properties in low-frequency fluctuations and coherence collapse regimes.

Main Methods:

Experimental setup involving two semiconductor lasers coupled via a passive relay fiber loop.
High temporal resolution measurements to characterize synchronization quality.
Analysis of laser dynamics under varying pump currents, focusing on chaotic regimes.

Main Results:

Achieved zero-lag chaos synchronization between the two semiconductor lasers.
Observed a significant decrease in synchronization quality as lasers entered the coherence collapse regime.
Identified bubbling events as the cause of synchronization loss, with increased frequency at higher pump currents.

Conclusions:

Chaos synchronization in coupled semiconductor lasers is sensitive to operating conditions.
The coherence collapse regime exhibits poorer synchronization quality compared to low-frequency fluctuations.
Bubbling events are critical indicators of synchronization breakdown in these systems.