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Low-frequency fluctuations in two-state quantum dot lasers
Evgeny A Viktorov1, Paul Mandel, Ian O'Driscoll
1Optic Nonlineaire Theorique, Université Libre de Bruxelles, Campus Plaine CP 231, B-1050 Bruxelles, Belgium.
Optics Letters
|July 13, 2006
Summary
Optical feedback causes instabilities in quantum dot semiconductor lasers. This leads to power fluctuations between ground and excited states, maintaining constant total output power.
Area of Science:
- Quantum optics
- Semiconductor device physics
- Laser dynamics
Background:
- Quantum dot semiconductor lasers operate in both ground and excited states.
- These devices can exhibit antiphase fluctuations without external influences.
- Understanding laser stability is crucial for device applications.
Purpose of the Study:
- To investigate feedback-induced instabilities in quantum dot semiconductor lasers.
- To analyze the dynamic behavior of ground and excited states under optical feedback.
- To determine the effect of feedback on total output power.
Main Methods:
- Experimental study of a quantum dot semiconductor laser.
- Analysis of laser dynamics with and without optical feedback.
- Measurement of power fluctuations in ground and excited states.
Main Results:
- Without optical feedback, antiphase fluctuations occur between ground and excited states, with constant total output power.
- Optical feedback induces power dropouts in the ground state.
- Optical feedback causes intensity bursts in the excited state, maintaining constant total output power.
Conclusions:
- Optical feedback significantly alters the dynamic behavior of quantum dot semiconductor lasers.
- The observed power dropouts and bursts maintain overall power stability.
- These findings are important for controlling and optimizing laser performance.
