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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| Format: | Article |
| Language: | English |
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MDPI AG
2023-10-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/20/8364 |
| _version_ | 1827719911746568192 |
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| author | Tao Zeng Ya Gui Yuliang Yi Nan Li Zhi Zhang Jiewei Guo Binpeng Shang Lanjun Guo |
| author_facet | Tao Zeng Ya Gui Yuliang Yi Nan Li Zhi Zhang Jiewei Guo Binpeng Shang Lanjun Guo |
| author_sort | Tao Zeng |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-10T20:54:20Z |
| format | Article |
| id | doaj.art-0838ecf8f1d440eaad3523fa4d69367b |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T20:54:20Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-0838ecf8f1d440eaad3523fa4d69367b2023-11-19T18:01:45ZengMDPI AGSensors1424-82202023-10-012320836410.3390/s23208364A Simulation of Air Lasing Seeded by an External Wave in a Femtosecond Laser FilamentTao Zeng0Ya Gui1Yuliang Yi2Nan Li3Zhi Zhang4Jiewei Guo5Binpeng Shang6Lanjun Guo7Chongqing Key Laboratory of Micro & Nano Structure Optoeletronics, School of Physical Science and Technology, Southwest University, Chongqing 400715, ChinaChongqing Vocational College of Transportation, Chongqing 402247, ChinaChongqing Key Laboratory of Micro & Nano Structure Optoeletronics, School of Physical Science and Technology, Southwest University, Chongqing 400715, ChinaChongqing Key Laboratory of Micro & Nano Structure Optoeletronics, School of Physical Science and Technology, Southwest University, Chongqing 400715, ChinaTianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, ChinaTianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, ChinaTianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, ChinaTianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, ChinaAir 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.https://www.mdpi.com/1424-8220/23/20/8364femtosecond laser filamentationair laserspatial distributionnitrogen ion density |
| spellingShingle | Tao Zeng Ya Gui Yuliang Yi Nan Li Zhi Zhang Jiewei Guo Binpeng Shang Lanjun Guo A Simulation of Air Lasing Seeded by an External Wave in a Femtosecond Laser Filament Sensors femtosecond laser filamentation air laser spatial distribution nitrogen ion density |
| 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 | femtosecond laser filamentation air laser spatial distribution nitrogen ion density |
| url | https://www.mdpi.com/1424-8220/23/20/8364 |
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