Laser-mode bifurcations induced by PT-breaking exceptional points

Laser-mode bifurcations induced by PT-breaking exceptional points

A laser consisting of two independently pumped resonators can exhibit mode bifurcations that evolve out of the exceptional points (EPs) of the linear system at threshold. The EPs are non-Hermitian degeneracies occurring at the parity–time-reversal (PT) symmetry-breaking points of the threshold syste...

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Bibliographic Details
Main Authors: Zhu, Bofeng, Wang, Qi Jie, Chong, Yi Dong
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2019
Subjects:
Bifurcations
Laser Dynamics
DRNTU::Science::Physics
Online Access:https://hdl.handle.net/10356/100371
http://hdl.handle.net/10220/48575
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Institution: Nanyang Technological University
Language: English
Description
Summary:A laser consisting of two independently pumped resonators can exhibit mode bifurcations that evolve out of the exceptional points (EPs) of the linear system at threshold. The EPs are non-Hermitian degeneracies occurring at the parity–time-reversal (PT) symmetry-breaking points of the threshold system. Above threshold, the EPs become bifurcations of the nonlinear zero-detuned laser modes, which can be most easily observed by making the gain saturation intensities in the two resonators substantially different. Small pump variations can then switch abruptly between different laser behavior, e.g., between below-threshold and PT-broken single-mode operation.

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