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A Simulation of Air Lasing Seeded by an External Wave in a Femtosecond Laser Filament

Air lasers induced by femtosecond laser filaments play an important role in remote sensing applications. Few studies have been dedicated to the spatial distribution of external-seeded air laser radiation in the laser filament based on the numerical simulation method, which can pave the way to unders...

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Detalles Bibliográficos
Autores principales: Zeng, Tao, Gui, Ya, Yi, Yuliang, Li, Nan, Zhang, Zhi, Guo, Jiewei, Shang, Binpeng, Guo, Lanjun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10611277/
https://www.ncbi.nlm.nih.gov/pubmed/37896458
http://dx.doi.org/10.3390/s23208364
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author Zeng, Tao
Gui, Ya
Yi, Yuliang
Li, Nan
Zhang, Zhi
Guo, Jiewei
Shang, Binpeng
Guo, Lanjun
author_facet Zeng, Tao
Gui, Ya
Yi, Yuliang
Li, Nan
Zhang, Zhi
Guo, Jiewei
Shang, Binpeng
Guo, Lanjun
author_sort Zeng, Tao
collection PubMed
description Air lasers induced by femtosecond laser filaments play an important role in remote sensing applications. Few studies have been dedicated to the spatial distribution of external-seeded air laser radiation in the laser filament based on the numerical simulation method, which can pave the way to understanding the mechanism of the external-seeded air lasing process during filamentation. In this study, numerical simulations of the propagation of an air laser seeded by an external plane wave with a wavelength of 391 nm during femtosecond laser filamentation were performed. The results indicated that the air laser’s beam intensity distribution varies from a ring pattern to a donut pattern when the filament length and nitrogen ion density are raised as a result of the defocusing and lasing effects of the filament plasma. Here, the ring pattern is formed by several thin rings, while the donut pattern refers to a notably thicker, ring-like structure. In addition, it has been demonstrated that the air laser’s beam power would increase exponentially versus the filament length and the nitrogen ion density. The knowledge about the angular distribution of air lasing could be important for optimizing the detection geometry of the LIDAR setup, including the view angle and the size of the collecting optical component.
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spelling pubmed-106112772023-10-28 A Simulation of Air Lasing Seeded by an External Wave in a Femtosecond Laser Filament Zeng, Tao Gui, Ya Yi, Yuliang Li, Nan Zhang, Zhi Guo, Jiewei Shang, Binpeng Guo, Lanjun Sensors (Basel) Article Air lasers induced by femtosecond laser filaments play an important role in remote sensing applications. Few studies have been dedicated to the spatial distribution of external-seeded air laser radiation in the laser filament based on the numerical simulation method, which can pave the way to understanding the mechanism of the external-seeded air lasing process during filamentation. In this study, numerical simulations of the propagation of an air laser seeded by an external plane wave with a wavelength of 391 nm during femtosecond laser filamentation were performed. The results indicated that the air laser’s beam intensity distribution varies from a ring pattern to a donut pattern when the filament length and nitrogen ion density are raised as a result of the defocusing and lasing effects of the filament plasma. Here, the ring pattern is formed by several thin rings, while the donut pattern refers to a notably thicker, ring-like structure. In addition, it has been demonstrated that the air laser’s beam power would increase exponentially versus the filament length and the nitrogen ion density. The knowledge about the angular distribution of air lasing could be important for optimizing the detection geometry of the LIDAR setup, including the view angle and the size of the collecting optical component. MDPI 2023-10-10 /pmc/articles/PMC10611277/ /pubmed/37896458 http://dx.doi.org/10.3390/s23208364 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zeng, Tao
Gui, Ya
Yi, Yuliang
Li, Nan
Zhang, Zhi
Guo, Jiewei
Shang, Binpeng
Guo, Lanjun
A Simulation of Air Lasing Seeded by an External Wave in a Femtosecond Laser Filament
title A Simulation of Air Lasing Seeded by an External Wave in a Femtosecond Laser Filament
title_full A Simulation of Air Lasing Seeded by an External Wave in a Femtosecond Laser Filament
title_fullStr A Simulation of Air Lasing Seeded by an External Wave in a Femtosecond Laser Filament
title_full_unstemmed A Simulation of Air Lasing Seeded by an External Wave in a Femtosecond Laser Filament
title_short A Simulation of Air Lasing Seeded by an External Wave in a Femtosecond Laser Filament
title_sort simulation of air lasing seeded by an external wave in a femtosecond laser filament
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10611277/
https://www.ncbi.nlm.nih.gov/pubmed/37896458
http://dx.doi.org/10.3390/s23208364
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