Regularization of vertical-cavity surface-emitting laser emission by periodic non-Hermitian potentials

We propose a novel physical mechanism based on periodic non-Hermitian potentials to efficiently control the complex spatial dynamics of broad-area lasers, particularly in vertical-cavity surface-emitting lasers (VCSELs), achieving a stable emission of maximum brightness. A radially dephased periodic...

Full description

Saved in:
Bibliographic Details
Published in:Optics letters 2019-08, Vol.44 (16), p.3948-3951
Main Authors: Ahmed, Waqas Waseem, Herrero, Ramon, Botey, Muriel, Wu, Ying, Staliunas, Kestutis
Format: Article
Language:English
Subjects:
Beams (structural)
Coupling
Emission
Física
Gain-Loss
Light sources
Luminous intensity
Làsers de semiconductors
Refractivity
Regularization
Semiconductor lasers
Transverse waves
Vertical cavity surface emission lasers
Àrees temàtiques de la UPC
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We propose a novel physical mechanism based on periodic non-Hermitian potentials to efficiently control the complex spatial dynamics of broad-area lasers, particularly in vertical-cavity surface-emitting lasers (VCSELs), achieving a stable emission of maximum brightness. A radially dephased periodic refractive index and gain-loss modulations accumulate the generated light from the entire active layer and concentrate it around the structure axis to emit narrow, bright beams. The effect is due to asymmetric inward radial coupling between transverse wave vectors for particular phase differences of the refractive index and gain-loss modulations. Light is confined into a central beam with large intensity, opening the path to design compact, bright, and efficient broad-area light sources. We perform a comprehensive analysis to explore the maximum central intensity enhancement and concentration regimes. This Letter reveals that the optimum schemes are those holding unidirectional inward coupling, but not fulfilling a perfect local PT-symmetry.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.44.003948