We theoretically study the collective excitation modes of a topological laser device operating in a single-mode steady state with monochromatic emission. We consider a model device based on a two-dimensional photonic Harper-Hofstadter lattice including a broadband gain medium localized on the system edge. Different regimes are considered as a function of the value of the optical nonlinearity and of the gain relaxation time. The dispersion of the excitation modes is calculated via a full two-dimensional Bogoliubov approach and physically interpreted in terms of an effective one-dimensional theory. Depending on the system parameters, various possible physical processes leading to dynamical instabilities are identified and characterized. On this basis, strategies to enforce a stable single-mode topological laser operation are finally pointed out.

Linearized theory of the fluctuation dynamics in two-dimensional topological lasers / Loirette-Pelous, A; Amelio, I; Secli, M; Carusotto, I. - In: PHYSICAL REVIEW A. - ISSN 2469-9926. - 104:5(2021). [10.1103/PhysRevA.104.053516]

Linearized theory of the fluctuation dynamics in two-dimensional topological lasers

Carusotto I
2021-01-01

Abstract

We theoretically study the collective excitation modes of a topological laser device operating in a single-mode steady state with monochromatic emission. We consider a model device based on a two-dimensional photonic Harper-Hofstadter lattice including a broadband gain medium localized on the system edge. Different regimes are considered as a function of the value of the optical nonlinearity and of the gain relaxation time. The dispersion of the excitation modes is calculated via a full two-dimensional Bogoliubov approach and physically interpreted in terms of an effective one-dimensional theory. Depending on the system parameters, various possible physical processes leading to dynamical instabilities are identified and characterized. On this basis, strategies to enforce a stable single-mode topological laser operation are finally pointed out.
2021
5
Loirette-Pelous, A; Amelio, I; Secli, M; Carusotto, I
Linearized theory of the fluctuation dynamics in two-dimensional topological lasers / Loirette-Pelous, A; Amelio, I; Secli, M; Carusotto, I. - In: PHYSICAL REVIEW A. - ISSN 2469-9926. - 104:5(2021). [10.1103/PhysRevA.104.053516]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/342908
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