Optimizing the spectrum of high power narrow linewidth fiber amplifier through the same complex degree of coherence
The spectra of narrow linewidth fiber amplifiers are closely related to both the stimulated Brillouin scattering (SBS) threshold in power scaling process and the combining efficiency in coherent beam combining (CBC) system. In this manuscript, the SBS thresholds of fiber amplifier with different spe...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-11-01
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| Series: | Frontiers in Physics |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fphy.2022.1062533/full |
| _version_ | 1811331308098420736 |
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| author | Wenchang Lai Pengfei Ma Pengfei Ma Pengfei Ma Jiaxin Song Jiaxin Song Jiaxin Song Shuai Ren Wei Liu Wei Liu Wei Liu Pu Zhou |
| author_facet | Wenchang Lai Pengfei Ma Pengfei Ma Pengfei Ma Jiaxin Song Jiaxin Song Jiaxin Song Shuai Ren Wei Liu Wei Liu Wei Liu Pu Zhou |
| author_sort | Wenchang Lai |
| collection | DOAJ |
| description | The spectra of narrow linewidth fiber amplifiers are closely related to both the stimulated Brillouin scattering (SBS) threshold in power scaling process and the combining efficiency in coherent beam combining (CBC) system. In this manuscript, the SBS thresholds of fiber amplifier with different spectral distributions (Gaussian, sinc2 and rectangular) have been compared under the same spectral complex degree of coherence (CDC), which could promise the same combining efficiency in CBC system. A SBS dynamic model is established to analyze the SBS process in fiber amplifier and a comparing experiment is also performed by measuring the SBS thresholds of different spectra that have the same CDC set to be 0.96. The FWHM linewidths of Gaussian, sinc2 and rectangular spectra are adjusted to be 1.1 GHz, 0.5 GHz and 1.06 GHz, respectively. The corresponding SBS thresholds are measured to be 108 W, 77 W, and 135 W. By contrast, the rectangular spectra could have most excellent capacity on improving SBS threshold in fiber amplifier under the same combining efficiency in CBC system. Overall, it could provide a feasible method on spectra designing in high power narrow linewidth fiber amplifiers used in CBC system. |
| first_indexed | 2024-04-13T16:17:38Z |
| format | Article |
| id | doaj.art-e9b08eda34494109aedeaf785dc04c2c |
| institution | Directory Open Access Journal |
| issn | 2296-424X |
| language | English |
| last_indexed | 2024-04-13T16:17:38Z |
| publishDate | 2022-11-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physics |
| spelling | doaj.art-e9b08eda34494109aedeaf785dc04c2c2022-12-22T02:40:01ZengFrontiers Media S.A.Frontiers in Physics2296-424X2022-11-011010.3389/fphy.2022.10625331062533Optimizing the spectrum of high power narrow linewidth fiber amplifier through the same complex degree of coherenceWenchang Lai0Pengfei Ma1Pengfei Ma2Pengfei Ma3Jiaxin Song4Jiaxin Song5Jiaxin Song6Shuai Ren7Wei Liu8Wei Liu9Wei Liu10Pu Zhou11College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaNanhu Laser Laboratory, National University of Defense Technology, Changsha, ChinaHunan Provincial Key Laboratory of High Energy Laser Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaNanhu Laser Laboratory, National University of Defense Technology, Changsha, ChinaHunan Provincial Key Laboratory of High Energy Laser Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaNanhu Laser Laboratory, National University of Defense Technology, Changsha, ChinaHunan Provincial Key Laboratory of High Energy Laser Technology, Changsha, ChinaCollege of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, ChinaThe spectra of narrow linewidth fiber amplifiers are closely related to both the stimulated Brillouin scattering (SBS) threshold in power scaling process and the combining efficiency in coherent beam combining (CBC) system. In this manuscript, the SBS thresholds of fiber amplifier with different spectral distributions (Gaussian, sinc2 and rectangular) have been compared under the same spectral complex degree of coherence (CDC), which could promise the same combining efficiency in CBC system. A SBS dynamic model is established to analyze the SBS process in fiber amplifier and a comparing experiment is also performed by measuring the SBS thresholds of different spectra that have the same CDC set to be 0.96. The FWHM linewidths of Gaussian, sinc2 and rectangular spectra are adjusted to be 1.1 GHz, 0.5 GHz and 1.06 GHz, respectively. The corresponding SBS thresholds are measured to be 108 W, 77 W, and 135 W. By contrast, the rectangular spectra could have most excellent capacity on improving SBS threshold in fiber amplifier under the same combining efficiency in CBC system. Overall, it could provide a feasible method on spectra designing in high power narrow linewidth fiber amplifiers used in CBC system.https://www.frontiersin.org/articles/10.3389/fphy.2022.1062533/fullfiber amplifiernarrow linewidthhigh powerstimulated Brillouin scatteringspectral optimization |
| spellingShingle | Wenchang Lai Pengfei Ma Pengfei Ma Pengfei Ma Jiaxin Song Jiaxin Song Jiaxin Song Shuai Ren Wei Liu Wei Liu Wei Liu Pu Zhou Optimizing the spectrum of high power narrow linewidth fiber amplifier through the same complex degree of coherence Frontiers in Physics fiber amplifier narrow linewidth high power stimulated Brillouin scattering spectral optimization |
| title | Optimizing the spectrum of high power narrow linewidth fiber amplifier through the same complex degree of coherence |
| title_full | Optimizing the spectrum of high power narrow linewidth fiber amplifier through the same complex degree of coherence |
| title_fullStr | Optimizing the spectrum of high power narrow linewidth fiber amplifier through the same complex degree of coherence |
| title_full_unstemmed | Optimizing the spectrum of high power narrow linewidth fiber amplifier through the same complex degree of coherence |
| title_short | Optimizing the spectrum of high power narrow linewidth fiber amplifier through the same complex degree of coherence |
| title_sort | optimizing the spectrum of high power narrow linewidth fiber amplifier through the same complex degree of coherence |
| topic | fiber amplifier narrow linewidth high power stimulated Brillouin scattering spectral optimization |
| url | https://www.frontiersin.org/articles/10.3389/fphy.2022.1062533/full |
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