Non-Hermitian arrangement for stable semiconductor laser arrays

We propose and explore a physical mechanism for the stabilization of the complex spatiotemporal dynamics in arrays (bars) of broad area laser diodes taking advantage of the symmetry breaking in non-Hermitian potentials. We show that such stabilization can be achieved by specific pump and index profiles leading to a PT-symmetric coupling between nearest neighboring lasers within the semiconductor bar. A numerical analysis is performed using a complete (2 + 1)-dimensional space-temporal model, including transverse and longitudinal spatial degrees of freedom and temporal evolution of the electric field and carriers. We show regimes of temporal stabilization and light emission spatial redistribution and enhancement. We also consider a simplified (1 + 1)-dimensional model for an array of lasers holding the proposed non-Hermitian coupling with a global axisymmetric geometry. We numerically demonstrate a two-fold benefit: the control over the temporal dynamics over the EELs bar and the field concentration on the central lasers leading to a brighter output beam, facilitating a direct coupling to an optical fiber. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

This study proposes a physical mechanism for stabilizing the complex spatiotemporal dynamics in arrays of broad area laser diodes by taking advantage of symmetry breaking in non-Hermitian potentials. Numerical analysis using a (2 + 1)-dimensional model shows regimes of temporal stabilization and light emission spatial redistribution and enhancement. The study also demonstrates a two-fold benefit with a simplified (1 + 1)-dimensional model for controlling temporal dynamics and enhancing output beam brightness through field concentration.