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Non-linear dynamics of multimode semiconductor lasers: dispersion-based phase instability and route to
Optics Letters
|March 22, 2023
Summary
Researchers studied multimode semiconductor laser emission dynamics. They found modulational instability and unique behaviors like self-mode locking due to carrier dynamics and dispersion.
Area of Science:
- Semiconductor laser physics
- Non-linear optics
- Quantum well devices
Background:
- Broadband semiconductor lasers are crucial for various applications.
- Understanding their emission dynamics is key to controlling laser output.
- Non-linear effects and dispersion significantly influence laser behavior.
Purpose of the Study:
- Investigate the emission dynamics of a multimode broadband interband semiconductor laser.
- Analyze the role of non-linear dynamics and cavity dispersion.
- Explore the impact of carrier dynamics on laser instability.
Main Methods:
- Experimental investigation of laser emission.
- Theoretical modeling of non-linear dynamics.
- Analysis of modulational instability in different dispersion regimes.
Main Results:
- Identified modulational instability in the anomalous dispersion regime.
- Observed an additional unstable region in the normal dispersion regime due to carrier dynamics.
- Demonstrated phase turbulence, self-excited oscillations, self-mode locking, and single-frequency emission.
Conclusions:
- Cavity dispersion and non-linearities interplay to shape laser emission characteristics.
- Laser behavior is influenced by the gain medium's recovery time relative to round trip time.
- Observed phenomena are general for lasers with slow gain media and no spatial inhomogeneities.
