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Low-frequency self-pulsations in asymmetric external-cavity semiconductor lasers due to multiple-feedback effects.

J D Park, D S Seo, J G McInerney

|September 16, 2009

Summary

External-cavity semiconductor lasers with tilt asymmetries exhibit low-frequency self-pulsations. A new rate-equation model explains these pulsations, crucial for understanding laser instabilities and chaos.

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Area of Science:

Optics and Photonics
Semiconductor Physics
Nonlinear Dynamics

Background:

External-cavity semiconductor lasers (ECSLs) are vital components in various applications.
Understanding dynamical instabilities in ECSLs is crucial for reliable operation.
Deliberate introduction of asymmetries can influence laser dynamics.

Purpose of the Study:

To investigate the dynamical stability of ECSLs with intentional tilt asymmetries.
To explain the origin of experimentally observed low-frequency self-pulsations.
To elucidate the dependence of self-pulsation characteristics on various physical parameters.

Main Methods:

Development of a novel rate-equation model incorporating a time-dependent effective reflectivity.
Application of small-signal analysis to the developed rate-equation model.
Experimental observation and characterization of self-pulsations in tilted ECSLs.

Main Results:

The new model successfully explains low-frequency self-pulsations in tilted ECSLs.
Self-pulsation frequency is dependent on feedback asymmetry, injection current, and cavity length.
The strength and degree of feedback asymmetry significantly influence self-pulsation behavior.

Conclusions:

Tilt asymmetries in ECSLs can lead to predictable low-frequency self-pulsations.
The developed rate-equation model provides a robust framework for analyzing ECSL dynamics.
These findings are essential for controlling and interpreting complex dynamical behaviors in ECSLs, including chaos.