Spatial and spectral mode-selection effects in topological lasers with frequency-dependent gain

Year: 2021

Authors: Secli M.; Ozawa T.; Capone M.; Carusotto I.

Autors Affiliation: Int Sch Adv Studies SISSA, Via Bonomea 265, I-34136 Trieste, Italy; Tohoku Univ, Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan; CNR, IOM Democritos, Via Bonomea 265, I-34136 Trieste, Italy; Univ Trento, CNR, BEC Ctr, INO, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy.

Abstract: We develop a semiclassical theory of laser oscillation into a chiral edge state of a topological photonic system endowed with a frequency-dependent gain. As an archetypal model of this physics, we consider a Harper-Hofstadter lattice embedding population-inverted, two-level atoms as a gain material. We show that a suitable design of the spatial distribution of gain and its spectral shape provides flexible mode-selection mechanisms that can stabilize single-mode lasing into an edge state. Implications of our results for recent experiments are outlined.

Journal/Review: APL PHOTONICS

Volume: 6 (5)      Pages from: 050803-1  to: 050803-9

KeyWords: EDGE STATES
DOI: 10.1063/5.0041124

Citations: 7
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