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Title: Anomalous single-mode lasing induced by nonlinearity and the non-hermitian skin effect
Authors: Zhu, Bofeng
Wang, Qiang
Leykam, Daniel
Xue, Haoran
Wang, Qi Jie
Chong, Yidong
Keywords: Science::Physics
Issue Date: 2022
Source: Zhu, B., Wang, Q., Leykam, D., Xue, H., Wang, Q. J. & Chong, Y. (2022). Anomalous single-mode lasing induced by nonlinearity and the non-hermitian skin effect. Physical Review Letters, 129(1), 013903-1-013903-7.
Project: MOE2016- T3-1-006
NRF-CRP23- 2019-0007
Journal: Physical Review Letters 
Abstract: Single-mode operation is a desirable but elusive property for lasers operating at high pump powers. Typically, single-mode lasing is attainable close to threshold, but increasing the pump power gives rise to multiple lasing peaks due to inter-modal gain competition. We propose a laser with the opposite behavior: multimode lasing occurs at low output powers, but pumping beyond a certain value produces a single lasing mode, with all other candidate modes experiencing negative effective gain. This phenomenon arises in a lattice of coupled optical resonators with non-fine-tuned asymmetric couplings, and is caused by an interaction between nonlinear gain saturation and the non-Hermitian skin effect. The single-mode lasing is observed in both frequency domain and time domain simulations. It is robust against on-site disorder, and scales up to large lattice sizes. This finding might be useful for implementing high-power laser arrays.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.129.013903
DOI (Related Dataset): 10.21979/N9/IRT7YF
Schools: School of Physical and Mathematical Sciences 
School of Electrical and Electronic Engineering 
Research Centres: Centre for Quantum Technologies 
Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2022 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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