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Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis

Mode-locked fiber lasers based on nonlinear polarization evolution can generate femtosecond pulses with different pulse widths and rich spectral distributions for versatile applications through polarization tuning. However, a precise and repeatable location of a specific pulsation regime is extremel...

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Autores principales: Pu, Guoqing, Yi, Lilin, Zhang, Li, Luo, Chao, Li, Zhaohui, Hu, Weisheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6987192/
https://www.ncbi.nlm.nih.gov/pubmed/32025296
http://dx.doi.org/10.1038/s41377-020-0251-x
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author Pu, Guoqing
Yi, Lilin
Zhang, Li
Luo, Chao
Li, Zhaohui
Hu, Weisheng
author_facet Pu, Guoqing
Yi, Lilin
Zhang, Li
Luo, Chao
Li, Zhaohui
Hu, Weisheng
author_sort Pu, Guoqing
collection PubMed
description Mode-locked fiber lasers based on nonlinear polarization evolution can generate femtosecond pulses with different pulse widths and rich spectral distributions for versatile applications through polarization tuning. However, a precise and repeatable location of a specific pulsation regime is extremely challenging. Here, by using fast spectral analysis based on a time-stretched dispersion Fourier transform as the spectral discrimination criterion, along with an intelligent polarization search algorithm, for the first time, we achieved real-time control of the spectral width and shape of mode-locked femtosecond pulses; the spectral width can be tuned from 10 to 40 nm with a resolution of ~1.47 nm, and the spectral shape can be programmed to be hyperbolic secant or triangular. Furthermore, we reveal the complex, repeatable transition dynamics of the spectrum broadening of femtosecond pulses, including five middle phases, which provides deep insight into ultrashort pulse formation that cannot be observed with traditional mode-locked lasers.
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spelling pubmed-69871922020-02-05 Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis Pu, Guoqing Yi, Lilin Zhang, Li Luo, Chao Li, Zhaohui Hu, Weisheng Light Sci Appl Article Mode-locked fiber lasers based on nonlinear polarization evolution can generate femtosecond pulses with different pulse widths and rich spectral distributions for versatile applications through polarization tuning. However, a precise and repeatable location of a specific pulsation regime is extremely challenging. Here, by using fast spectral analysis based on a time-stretched dispersion Fourier transform as the spectral discrimination criterion, along with an intelligent polarization search algorithm, for the first time, we achieved real-time control of the spectral width and shape of mode-locked femtosecond pulses; the spectral width can be tuned from 10 to 40 nm with a resolution of ~1.47 nm, and the spectral shape can be programmed to be hyperbolic secant or triangular. Furthermore, we reveal the complex, repeatable transition dynamics of the spectrum broadening of femtosecond pulses, including five middle phases, which provides deep insight into ultrashort pulse formation that cannot be observed with traditional mode-locked lasers. Nature Publishing Group UK 2020-01-28 /pmc/articles/PMC6987192/ /pubmed/32025296 http://dx.doi.org/10.1038/s41377-020-0251-x Text en © The Author(s) 2020 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/.
spellingShingle Article
Pu, Guoqing
Yi, Lilin
Zhang, Li
Luo, Chao
Li, Zhaohui
Hu, Weisheng
Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis
title Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis
title_full Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis
title_fullStr Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis
title_full_unstemmed Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis
title_short Intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis
title_sort intelligent control of mode-locked femtosecond pulses by time-stretch-assisted real-time spectral analysis
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6987192/
https://www.ncbi.nlm.nih.gov/pubmed/32025296
http://dx.doi.org/10.1038/s41377-020-0251-x
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