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A large-scale single-mode array laser based on a topological edge mode.

Natsuko Ishida¹, Yasutomo Ota^2,3, Wenbo Lin^1,4

¹Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo, 153-8505, Japan.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

This summary is machine-generated.

Topological lasers offer robust single-mode operation. This study shows large-scale topological lasers with strong coupling and low loss achieve stable single-mode lasing, paving the way for high-power applications.

Keywords:

high power laser lasers photonic crystals semiconductor lasers topological lasers topological photonics

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Area of Science:

Photonics and Laser Technology
Condensed Matter Physics
Topological Materials

Background:

Topological lasers are promising for robust single-mode operation due to topological edge states.
These edge states offer inherent robustness against disorder, a key challenge in laser design.

Purpose of the Study:

To theoretically analyze a large-scale single-mode topological laser.
To evaluate the stability of single-mode lasing in a multi-site resonator array.

Main Methods:

Utilized the tight-binding approximation to model a laser array.
Calculated the threshold gain difference (Δα) between edge and bulk modes.
Assessed the impact of coupling strength, losses, disorder, and long-range interactions.

Main Results:

Stronger inter-cavity couplings and lower losses enhance stable single-mode lasing.
A threshold gain difference of ~2 cm⁻¹ was achieved with realistic parameters (100 cm⁻¹ coupling).
The laser design demonstrates robustness against disorders and long-range interactions.

Conclusions:

Stable single-mode lasing in large-scale topological lasers is achievable with optimized parameters.
These findings support the development of high-power topological lasers for practical applications.
The theoretical framework provides a basis for designing robust, single-mode laser systems.