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Emergence of resonant mode-locking via delayed feedback in quantum dot semiconductor lasers
Optics Express
|February 25, 2016
Summary
Quantum dot lasers exhibit spontaneous mode-locking under strong optical feedback, a novel mechanism distinct from chaos. This occurs via resonance between relaxation oscillation and external cavity rates.
Area of Science:
- Optics and Photonics
- Semiconductor Lasers
- Quantum Dot Devices
Background:
- Conventional semiconductor lasers often display chaotic output under external optical feedback.
- Understanding laser dynamics under varying feedback conditions is crucial for device applications.
Purpose of the Study:
- To investigate the dynamical behavior of single-mode quantum dot lasers under strong optical feedback.
- To identify and characterize novel dynamic regimes beyond typical chaotic responses.
Main Methods:
- Experimental analysis of single-mode quantum dot lasers subjected to strong optical feedback.
- Numerical simulations using rate equations specific to quantum dot laser dynamics.
Main Results:
- Observation of a new dynamical regime characterized by spontaneous mode-locking.
- Identification of a resonance mechanism between relaxation oscillation frequency and external cavity repetition rate driving mode-locking.
Conclusions:
- Spontaneous mode-locking represents a novel mechanism in semiconductor lasers, distinct from chaos.
- The findings offer new insights into controlling semiconductor laser dynamics through optical feedback.
