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Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption
Laser-induced grating spectroscopy (LIGS) is for the first time explored in a configuration based on the crossing of two focused femtosecond (fs) laser pulses (800-nm wavelength) and a focused continuous-wave (cw) laser beam (532-nm wavelength). A thermal grating was formed by multi-photon absorptio...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8110561/ https://www.ncbi.nlm.nih.gov/pubmed/33972614 http://dx.doi.org/10.1038/s41598-021-89269-2 |
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author | Ruchkina, Maria Hot, Dina Ding, Pengji Hosseinnia, Ali Bengtsson, Per-Erik Li, Zhongshan Bood, Joakim Sahlberg, Anna-Lena |
author_facet | Ruchkina, Maria Hot, Dina Ding, Pengji Hosseinnia, Ali Bengtsson, Per-Erik Li, Zhongshan Bood, Joakim Sahlberg, Anna-Lena |
author_sort | Ruchkina, Maria |
collection | PubMed |
description | Laser-induced grating spectroscopy (LIGS) is for the first time explored in a configuration based on the crossing of two focused femtosecond (fs) laser pulses (800-nm wavelength) and a focused continuous-wave (cw) laser beam (532-nm wavelength). A thermal grating was formed by multi-photon absorption of the fs-laser pulses by [Formula: see text] with a pulse energy around 700 [Formula: see text] J ([Formula: see text] 45 TW/[Formula: see text] ). The feasibility of this LIGS configuration was investigated for thermometry in heated nitrogen gas flows. The temperature was varied from room temperature up to 750 K, producing strong single-shot LIGS signals. A model based on the solution of the linearized hydrodynamic equations was used to extract temperature information from single-shot experimental data, and the results show excellent agreement with the thermocouple measurements. Furthermore, the fluorescence produced by the fs-laser pulses was investigated. This study indicates an 8-photon absorption pathway for [Formula: see text] in order to reach the [Formula: see text] state from the ground state, and 8 + 5 photon excitation to reach the [Formula: see text] state of the [Formula: see text] ion. At pulse energies higher than 1 mJ, the LIGS signal was disturbed due to the generation of plasma. Additionally, measurements in argon gas and air were performed, where the LIGS signal for argon shows lower intensity compared to air and [Formula: see text] . |
format | Online Article Text |
id | pubmed-8110561 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-81105612021-05-12 Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption Ruchkina, Maria Hot, Dina Ding, Pengji Hosseinnia, Ali Bengtsson, Per-Erik Li, Zhongshan Bood, Joakim Sahlberg, Anna-Lena Sci Rep Article Laser-induced grating spectroscopy (LIGS) is for the first time explored in a configuration based on the crossing of two focused femtosecond (fs) laser pulses (800-nm wavelength) and a focused continuous-wave (cw) laser beam (532-nm wavelength). A thermal grating was formed by multi-photon absorption of the fs-laser pulses by [Formula: see text] with a pulse energy around 700 [Formula: see text] J ([Formula: see text] 45 TW/[Formula: see text] ). The feasibility of this LIGS configuration was investigated for thermometry in heated nitrogen gas flows. The temperature was varied from room temperature up to 750 K, producing strong single-shot LIGS signals. A model based on the solution of the linearized hydrodynamic equations was used to extract temperature information from single-shot experimental data, and the results show excellent agreement with the thermocouple measurements. Furthermore, the fluorescence produced by the fs-laser pulses was investigated. This study indicates an 8-photon absorption pathway for [Formula: see text] in order to reach the [Formula: see text] state from the ground state, and 8 + 5 photon excitation to reach the [Formula: see text] state of the [Formula: see text] ion. At pulse energies higher than 1 mJ, the LIGS signal was disturbed due to the generation of plasma. Additionally, measurements in argon gas and air were performed, where the LIGS signal for argon shows lower intensity compared to air and [Formula: see text] . Nature Publishing Group UK 2021-05-10 /pmc/articles/PMC8110561/ /pubmed/33972614 http://dx.doi.org/10.1038/s41598-021-89269-2 Text en © The Author(s) 2021, corrected publication 2021 https://creativecommons.org/licenses/by/4.0/Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Ruchkina, Maria Hot, Dina Ding, Pengji Hosseinnia, Ali Bengtsson, Per-Erik Li, Zhongshan Bood, Joakim Sahlberg, Anna-Lena Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption |
title | Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption |
title_full | Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption |
title_fullStr | Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption |
title_full_unstemmed | Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption |
title_short | Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption |
title_sort | laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8110561/ https://www.ncbi.nlm.nih.gov/pubmed/33972614 http://dx.doi.org/10.1038/s41598-021-89269-2 |
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