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Self-organization in semiconductor lasers with ultrashort optical feedback
1Humboldt-Universität Berlin, Institut für Physik, Newtonstrasse 15, 12489 Berlin, Germany.
Physical Review Letters
|March 6, 2004
Summary
Investigating single-mode laser dynamics with short optical feedback delays reveals two Hopf bifurcations. These bifurcations lead to regular self-pulsations at distinct frequencies, offering insights into laser stability control.
Area of Science:
- Physics
- Nonlinear Dynamics
- Laser Physics
Background:
- Understanding laser dynamics is crucial for optical communication and sensing.
- Optical feedback can significantly alter laser behavior, leading to complex phenomena.
- Controlling laser output through feedback is an active area of research.
Purpose of the Study:
- To investigate the dynamical behavior of a single-mode laser under specific optical feedback conditions.
- To explore the influence of feedback phase on laser self-pulsations.
- To identify and characterize bifurcations leading to altered laser output.
Main Methods:
- Analysis of a single-mode laser model with short delay-time optical feedback.
- Utilizing an integrated distributed feedback device to control feedback phase.
- Observing and analyzing Hopf bifurcations and resulting self-pulsations.
Main Results:
- Observed two distinct types of Hopf bifurcations.
- Identified regular self-pulsations occurring at different frequencies.
- Demonstrated control over laser dynamics via feedback phase manipulation.
Conclusions:
- Short optical feedback delays can induce complex dynamical behaviors in single-mode lasers.
- Hopf bifurcations are key mechanisms for generating self-pulsations with controllable frequencies.
- Integrated feedback devices offer precise control over laser output characteristics.