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Feedback control systems

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Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
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Multimode regimes in quantum cascade lasers with optical feedback.

L L Columbo, M Brambilla

|June 13, 2014

Summary

This summary is machine-generated.

Quantum cascade lasers with optical feedback can achieve stable, coherent multimode oscillations. This study analyzes instability thresholds and reveals spontaneous phase-locking in unipolar laser emission beyond continuous wave instability.

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Area of Science:

Quantum optics
Semiconductor lasers
Nonlinear dynamics

Background:

Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
Optical feedback can destabilize laser emission.
Unipolar lasers lack relaxation oscillations, differing from conventional semiconductor lasers.

Purpose of the Study:

Investigate instability thresholds in QCLs with optical feedback.
Analyze laser dynamics beyond the continuous wave instability.
Determine the influence of external cavity modes on laser behavior.

Main Methods:

Utilized the Lang-Kobayashi model to describe optical feedback.
Performed exact linear stability analysis.
Developed an approximated analysis for unipolar lasers.

Main Results:

Identified instability thresholds for stationary emission.
Characterized laser regimes beyond the continuous wave instability.
Demonstrated that feedback can induce coherent multimode oscillations in unipolar lasers.

Conclusions:

Unipolar lasers with optical feedback can exhibit spontaneous phase-locking.
External cavity modes significantly influence laser dynamics and stability.
Coherent multimode operation is achievable in QCLs with feedback.