Spatiotemporal Stabilization of Locally PT-symmetric Semiconductor Lasers

TL;DR

This paper introduces a novel method using local PT-symmetric potentials to stabilize and control the spatiotemporal dynamics of semiconductor lasers, resulting in improved beam intensity, stability, and localization.

Contribution

The study presents a feasible scheme employing local PT-symmetry and pump modulation to enhance laser stability and beam quality, a new approach in laser dynamics control.

Findings

Enhanced intensity concentration and beam brightness.

Improved spatial regularization and temporal stability.

Effective control of spatiotemporal laser dynamics.

Abstract

We provide a feasible and compact scheme to control and stabilize the spatiotemporal dynamics of BAS lasers. The proposal is based on the ability of non-Hermitian potentials with given local symmetries to manage the flow of light. A local PT-symmetric configuration allows to control, enhance and localize the generated light. We impose a pump modulation, with a central symmetry axis which induces in-phase gain and refractive index modulations due to the Henry factor. Both modulations are, in turn, spatially dephased by an appropriate index profile to yield to a local PT-symmetry within the modified BAS laser. Such local PT-symmetry potential induces an inward mode coupling, accumulating the light generated from the entire active layer at the central symmetry axis, which ensures spatial regularization and temporal stability. By an exhaustive exploration of the modulation parameters, we show a significant improvement of the intensity concentration, stability and brightness of the emitted beam. This approach produces a two-fold benefit: light localization into a narrow beam emission and the control over the spatiotemporal dynamics, improving the laser performance.