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Experimental study of the influence of mode excitation on mode instability in high power fiber amplifier

Mode instability with different mode excitation has been investigated by off-splicing the fusion point in a 4 kW-level monolithic fiber laser system, which reveals that the fiber systems exciting more high order mode content exhibits lower beam quality but higher mode instability threshold. The stat...

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Autores principales: Chu, Qiuhui, Tao, Rumao, Li, Chengyu, Lin, Honghuan, Wang, Yuying, Guo, Chao, Wang, Jianjun, Jing, Feng, Tang, Chuanxiang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6598995/
https://www.ncbi.nlm.nih.gov/pubmed/31253873
http://dx.doi.org/10.1038/s41598-019-45787-8
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author Chu, Qiuhui
Tao, Rumao
Li, Chengyu
Lin, Honghuan
Wang, Yuying
Guo, Chao
Wang, Jianjun
Jing, Feng
Tang, Chuanxiang
author_facet Chu, Qiuhui
Tao, Rumao
Li, Chengyu
Lin, Honghuan
Wang, Yuying
Guo, Chao
Wang, Jianjun
Jing, Feng
Tang, Chuanxiang
author_sort Chu, Qiuhui
collection PubMed
description Mode instability with different mode excitation has been investigated by off-splicing the fusion point in a 4 kW-level monolithic fiber laser system, which reveals that the fiber systems exciting more high order mode content exhibits lower beam quality but higher mode instability threshold. The static-to-dynamic mode degradation and dynamic-only mode degradation have also been observed in the same high power fiber amplifier by varying the mode excitation, which implicates that the mode excitation plays an important role in mode characteristics in high power fiber lasers. By employing a seed with near fundamental mode beam quality, only dynamic mode degradation-mode instability sets in with negligible static beam quality degradation. Then the fusion point in the seed laser is offset spliced to excite high order mode. As the output power of the main amplifier scales, the beam quality degrades with the beam profile being static, and then the dynamic mode instability sets in, the power threshold of which is higher than that with good beam quality seed. We consider that the static mode degradation is caused by the presence of incoherent supposition of fundamental and high order mode, which leads to that the measured dynamic mode instability threshold is higher.
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spelling pubmed-65989952019-07-10 Experimental study of the influence of mode excitation on mode instability in high power fiber amplifier Chu, Qiuhui Tao, Rumao Li, Chengyu Lin, Honghuan Wang, Yuying Guo, Chao Wang, Jianjun Jing, Feng Tang, Chuanxiang Sci Rep Article Mode instability with different mode excitation has been investigated by off-splicing the fusion point in a 4 kW-level monolithic fiber laser system, which reveals that the fiber systems exciting more high order mode content exhibits lower beam quality but higher mode instability threshold. The static-to-dynamic mode degradation and dynamic-only mode degradation have also been observed in the same high power fiber amplifier by varying the mode excitation, which implicates that the mode excitation plays an important role in mode characteristics in high power fiber lasers. By employing a seed with near fundamental mode beam quality, only dynamic mode degradation-mode instability sets in with negligible static beam quality degradation. Then the fusion point in the seed laser is offset spliced to excite high order mode. As the output power of the main amplifier scales, the beam quality degrades with the beam profile being static, and then the dynamic mode instability sets in, the power threshold of which is higher than that with good beam quality seed. We consider that the static mode degradation is caused by the presence of incoherent supposition of fundamental and high order mode, which leads to that the measured dynamic mode instability threshold is higher. Nature Publishing Group UK 2019-06-28 /pmc/articles/PMC6598995/ /pubmed/31253873 http://dx.doi.org/10.1038/s41598-019-45787-8 Text en © The Author(s) 2019 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
Chu, Qiuhui
Tao, Rumao
Li, Chengyu
Lin, Honghuan
Wang, Yuying
Guo, Chao
Wang, Jianjun
Jing, Feng
Tang, Chuanxiang
Experimental study of the influence of mode excitation on mode instability in high power fiber amplifier
title Experimental study of the influence of mode excitation on mode instability in high power fiber amplifier
title_full Experimental study of the influence of mode excitation on mode instability in high power fiber amplifier
title_fullStr Experimental study of the influence of mode excitation on mode instability in high power fiber amplifier
title_full_unstemmed Experimental study of the influence of mode excitation on mode instability in high power fiber amplifier
title_short Experimental study of the influence of mode excitation on mode instability in high power fiber amplifier
title_sort experimental study of the influence of mode excitation on mode instability in high power fiber amplifier
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6598995/
https://www.ncbi.nlm.nih.gov/pubmed/31253873
http://dx.doi.org/10.1038/s41598-019-45787-8
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