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Anomalous single-mode lasing induced by nonlinearity and the non-Hermitian skin effect
- Source :
- Phys. Rev. Lett. 129, 013903 (2022)
- Publication Year :
- 2022
-
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: multi-mode 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 behavior 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.
- Subjects :
- Physics - Optics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 129, 013903 (2022)
- Publication Type :
- Report
- Accession number :
- edsarx.2202.13621
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.129.013903