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Single-mode quasi PT-symmetric laser with high power emission

Large-area lasers are practical for generating high output powers. However, this often comes at the expense of lower beam quality due to the introduction of higher-order modes. Here, we experimentally demonstrate a new type of electrically pumped, large-area edge-emitting lasers that exhibit a high...

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Autores principales: Şeker, Enes, Olyaeefar, Babak, Dadashi, Khalil, Şengül, Serdar, Teimourpour, Mohammad Hosain, El-Ganainy, Ramy, Demir, Abdullah
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10276020/
https://www.ncbi.nlm.nih.gov/pubmed/37328473
http://dx.doi.org/10.1038/s41377-023-01175-6
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author Şeker, Enes
Olyaeefar, Babak
Dadashi, Khalil
Şengül, Serdar
Teimourpour, Mohammad Hosain
El-Ganainy, Ramy
Demir, Abdullah
author_facet Şeker, Enes
Olyaeefar, Babak
Dadashi, Khalil
Şengül, Serdar
Teimourpour, Mohammad Hosain
El-Ganainy, Ramy
Demir, Abdullah
author_sort Şeker, Enes
collection PubMed
description Large-area lasers are practical for generating high output powers. However, this often comes at the expense of lower beam quality due to the introduction of higher-order modes. Here, we experimentally demonstrate a new type of electrically pumped, large-area edge-emitting lasers that exhibit a high power emission (∼0.4 W) and a high-quality beam (M(2)∼1.25). These favorable operational characteristics are enabled by establishing a quasi PT-symmetry between the second-order mode of a large area two-mode laser cavity and that of a single-mode auxiliary partner cavity, i.e., by implementing a partial isospectrality between the two coupled cavities. This in turn enlarges the effective volume of the higher-order modes. As a result, a selective pump applied via current injection into the main laser cavity can provide a stronger modal gain to the fundamental mode, and thus lead to lasing in the single mode regime after filtering out higher order transverse modes. The reported experimental results confirm this intuitive picture and are in good agreement with both theoretical and numerical analysis. Above all, the employed material platform and fabrication process are compatible with the industrial standards of semiconductor lasers. This work provides the first clear demonstration, beyond previous proof-of-concept studies, of the utility of PT-symmetry in building laser geometries with enhanced performance and, at the same time, useful output power levels and emission characteristics.
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spelling pubmed-102760202023-06-18 Single-mode quasi PT-symmetric laser with high power emission Şeker, Enes Olyaeefar, Babak Dadashi, Khalil Şengül, Serdar Teimourpour, Mohammad Hosain El-Ganainy, Ramy Demir, Abdullah Light Sci Appl Article Large-area lasers are practical for generating high output powers. However, this often comes at the expense of lower beam quality due to the introduction of higher-order modes. Here, we experimentally demonstrate a new type of electrically pumped, large-area edge-emitting lasers that exhibit a high power emission (∼0.4 W) and a high-quality beam (M(2)∼1.25). These favorable operational characteristics are enabled by establishing a quasi PT-symmetry between the second-order mode of a large area two-mode laser cavity and that of a single-mode auxiliary partner cavity, i.e., by implementing a partial isospectrality between the two coupled cavities. This in turn enlarges the effective volume of the higher-order modes. As a result, a selective pump applied via current injection into the main laser cavity can provide a stronger modal gain to the fundamental mode, and thus lead to lasing in the single mode regime after filtering out higher order transverse modes. The reported experimental results confirm this intuitive picture and are in good agreement with both theoretical and numerical analysis. Above all, the employed material platform and fabrication process are compatible with the industrial standards of semiconductor lasers. This work provides the first clear demonstration, beyond previous proof-of-concept studies, of the utility of PT-symmetry in building laser geometries with enhanced performance and, at the same time, useful output power levels and emission characteristics. Nature Publishing Group UK 2023-06-16 /pmc/articles/PMC10276020/ /pubmed/37328473 http://dx.doi.org/10.1038/s41377-023-01175-6 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Şeker, Enes
Olyaeefar, Babak
Dadashi, Khalil
Şengül, Serdar
Teimourpour, Mohammad Hosain
El-Ganainy, Ramy
Demir, Abdullah
Single-mode quasi PT-symmetric laser with high power emission
title Single-mode quasi PT-symmetric laser with high power emission
title_full Single-mode quasi PT-symmetric laser with high power emission
title_fullStr Single-mode quasi PT-symmetric laser with high power emission
title_full_unstemmed Single-mode quasi PT-symmetric laser with high power emission
title_short Single-mode quasi PT-symmetric laser with high power emission
title_sort single-mode quasi pt-symmetric laser with high power emission
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10276020/
https://www.ncbi.nlm.nih.gov/pubmed/37328473
http://dx.doi.org/10.1038/s41377-023-01175-6
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