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Self-pulsing in single section ring lasers based on quantum dot materials: theory and simulations.

Lorenzo Luigi Columbo, Paolo Bardella, Mariangela Gioannini

|August 17, 2018

Summary

Semiconductor ring lasers with quantum dots exhibit self-mode-locking, generating ultra-short pulses. This phenomenon, driven by a specific instability, enables terahertz repetition rates for advanced laser applications.

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Area of Science:

Optics and Photonics
Quantum Electronics
Semiconductor Physics

Background:

Semiconductor ring lasers are crucial for various optical applications.
Understanding multimode dynamics is key to controlling laser output.
Quantum dot active regions offer unique properties for laser design.

Purpose of the Study:

To theoretically investigate coherent phenomena in semiconductor ring lasers.
To analyze the multimode dynamics of single-section lasers with quantum dots.
To explore the conditions leading to ultra-short pulse generation.

Main Methods:

Theoretical study of coherent phenomena.
Multimode dynamics simulations in a unidirectional ring configuration.
Linear stability analysis (LSA) of traveling wave (TW) solutions.

Main Results:

Observed self-mode-locking in the quantum dot semiconductor ring laser.
Generated ultra-short pulses with durations under a picosecond.
Achieved terahertz repetition rates for the generated pulses.
Identified an instability analogous to the Risken-Nummedal-Graham-Haken (RNGH) instability.

Conclusions:

Self-mode-locking is achievable in quantum dot semiconductor ring lasers.
The identified instability triggers ultra-short pulse generation and terahertz rates.
Theoretical findings provide insights for designing advanced ultrafast semiconductor lasers.