Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers
Abstract In this paper, we report a coherent beam combining (CBC) system that involves two thulium-doped all-polarization maintaining (PM) fiber chirped pulse amplifiers. Through phase-locking the two channels via a fiber stretcher by using the stochastic parallel gradient descent (SPGD) algorithm,...
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| Language: | English |
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Springer & Higher Education Press
2024-05-01
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| Series: | Frontiers of Optoelectronics |
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| Online Access: | https://doi.org/10.1007/s12200-024-00117-3 |
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| author | Bo Ren Hongxiang Chang Can Li Tao Wang Kaikai Jin Jiayi Zhang Kun Guo Rongtao Su Jinyong Leng Pu Zhou |
| author_facet | Bo Ren Hongxiang Chang Can Li Tao Wang Kaikai Jin Jiayi Zhang Kun Guo Rongtao Su Jinyong Leng Pu Zhou |
| author_sort | Bo Ren |
| collection | DOAJ |
| description | Abstract In this paper, we report a coherent beam combining (CBC) system that involves two thulium-doped all-polarization maintaining (PM) fiber chirped pulse amplifiers. Through phase-locking the two channels via a fiber stretcher by using the stochastic parallel gradient descent (SPGD) algorithm, a maximum average power of 265 W is obtained, with a CBC efficiency of 81% and a residual phase error of λ/17. After de-chirping by a pair of diffraction gratings, the duration of the combined laser pulse is compressed to 690 fs. Taking into account the compression efficiency of 90% and the main peak energy proportion of 91%, the corresponding peak power is calculated to be 4 MW. The laser noise characteristics before and after CBC are examined, and the results indicate that the CBC would degrade the low frequency relative intensity noise (RIN), of which the integration is 1.74% in [100 Hz, 2 MHz] at the maximum combined output power. In addition, the effects of the nonlinear spectrum broadening during chirped pulse amplification on the CBC efficiency are also investigated, showing that a higher extent of pulse stretching is effective in alleviating the spectrum broadening and realizing a higher output power with decent combining efficiency. Graphical Abstract |
| format | Article |
| id | doaj-art-02c4b308b0c648b58cf9e41b3ef7a0bc |
| institution | Kabale University |
| issn | 2095-2767 |
| language | English |
| publishDate | 2024-05-01 |
| publisher | Springer & Higher Education Press |
| record_format | Article |
| series | Frontiers of Optoelectronics |
| spelling | doaj-art-02c4b308b0c648b58cf9e41b3ef7a0bc2025-01-19T12:10:19ZengSpringer & Higher Education PressFrontiers of Optoelectronics2095-27672024-05-0117111010.1007/s12200-024-00117-3Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiersBo Ren0Hongxiang Chang1Can Li2Tao Wang3Kaikai Jin4Jiayi Zhang5Kun Guo6Rongtao Su7Jinyong Leng8Pu Zhou9College of Advanced Interdisciplinary Studies, National University of Defense TechnologyCollege of Advanced Interdisciplinary Studies, National University of Defense TechnologyCollege of Advanced Interdisciplinary Studies, National University of Defense TechnologyCollege of Advanced Interdisciplinary Studies, National University of Defense TechnologyCollege of Advanced Interdisciplinary Studies, National University of Defense TechnologyCollege of Advanced Interdisciplinary Studies, National University of Defense TechnologyCollege of Advanced Interdisciplinary Studies, National University of Defense TechnologyCollege of Advanced Interdisciplinary Studies, National University of Defense TechnologyCollege of Advanced Interdisciplinary Studies, National University of Defense TechnologyCollege of Advanced Interdisciplinary Studies, National University of Defense TechnologyAbstract In this paper, we report a coherent beam combining (CBC) system that involves two thulium-doped all-polarization maintaining (PM) fiber chirped pulse amplifiers. Through phase-locking the two channels via a fiber stretcher by using the stochastic parallel gradient descent (SPGD) algorithm, a maximum average power of 265 W is obtained, with a CBC efficiency of 81% and a residual phase error of λ/17. After de-chirping by a pair of diffraction gratings, the duration of the combined laser pulse is compressed to 690 fs. Taking into account the compression efficiency of 90% and the main peak energy proportion of 91%, the corresponding peak power is calculated to be 4 MW. The laser noise characteristics before and after CBC are examined, and the results indicate that the CBC would degrade the low frequency relative intensity noise (RIN), of which the integration is 1.74% in [100 Hz, 2 MHz] at the maximum combined output power. In addition, the effects of the nonlinear spectrum broadening during chirped pulse amplification on the CBC efficiency are also investigated, showing that a higher extent of pulse stretching is effective in alleviating the spectrum broadening and realizing a higher output power with decent combining efficiency. Graphical Abstracthttps://doi.org/10.1007/s12200-024-00117-3Coherent beam combiningThulium-doped fiber laserHigh-average powerChirped pulse amplifier |
| spellingShingle | Bo Ren Hongxiang Chang Can Li Tao Wang Kaikai Jin Jiayi Zhang Kun Guo Rongtao Su Jinyong Leng Pu Zhou Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers Frontiers of Optoelectronics Coherent beam combining Thulium-doped fiber laser High-average power Chirped pulse amplifier |
| title | Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers |
| title_full | Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers |
| title_fullStr | Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers |
| title_full_unstemmed | Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers |
| title_short | Coherent beam combining of two all-PM thulium-doped fiber chirped pulse amplifiers |
| title_sort | coherent beam combining of two all pm thulium doped fiber chirped pulse amplifiers |
| topic | Coherent beam combining Thulium-doped fiber laser High-average power Chirped pulse amplifier |
| url | https://doi.org/10.1007/s12200-024-00117-3 |
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