Tiled-aperture coherent beam combining of two high-power fibre amplifiers
We demonstrate coherent beam combining of two tiled-aperture single-frequency fibre amplifiers with a total output power of 29.65 W by using the multi-dithering technique. The two laser beams are packaged closely by using free-space mirrors side by side into a tiled-aperture with a near-field fill f...
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| Published in | Chinese physics B Vol. 19; no. 1; pp. 289 - 293 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
IOP Publishing
2010
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-1056 2058-3834 |
| DOI | 10.1088/1674-1056/19/1/014202 |
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| Abstract | We demonstrate coherent beam combining of two tiled-aperture single-frequency fibre amplifiers with a total output power of 29.65 W by using the multi-dithering technique. The two laser beams are packaged closely by using free-space mirrors side by side into a tiled-aperture with a near-field fill factor of 62%. Active phase control of the amplifier is performed on commercially available digital lock-in amplifiers. Experimental results show that the power contained in the main-lobe in closed-loop is 1.72 times greater than that in open-loop, which is 86% for the ideal case. The fringe contrast of the far-field fringe pattern is as high as 80% when the system is in closed-loop. The beam quality of the combined beam is computed to he BQ = 1.48. The whole system in closed-loop performs well in a long-time observation. |
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| AbstractList | We demonstrate coherent beam combining of two tiled-aperture single-frequency fibre amplifiers with a total output power of 29.65 W by using the multi-dithering technique. The two laser beams are packaged closely by using free-space mirrors side by side into a tiled-aperture with a near-field fill factor of 62%. Active phase control of the amplifier is performed on commercially available digital lock-in amplifiers. Experimental results show that the power contained in the main-lobe in closed-loop is 1.72 times greater than that in open-loop, which is 86% for the ideal case. The fringe contrast of the far-field fringe pattern is as high as 80% when the system is in closed-loop. The beam quality of the combined beam is computed to be BQ = 1.48. The whole system in closed-loop performs well in a long-time observation. We demonstrate coherent beam combining of two tiled-aperture single-frequency fibre amplifiers with a total output power of 29.65 W by using the multi-dithering technique. The two laser beams are packaged closely by using free-space mirrors side by side into a tiled-aperture with a near-field fill factor of 62%. Active phase control of the amplifier is performed on commercially available digital lock-in amplifiers. Experimental results show that the power contained in the main-lobe in closed-loop is 1.72 times greater than that in open-loop, which is 86% for the ideal case. The fringe contrast of the far-field fringe pattern is as high as 80% when the system is in closed-loop. The beam quality of the combined beam is computed to he BQ = 1.48. The whole system in closed-loop performs well in a long-time observation. |
| Author | 周朴 马阎星 王小林 马浩统 许晓军 刘泽金 |
| AuthorAffiliation | College of Optoelectric Science and Engineering, NationalUniversity of Defense Technology, Changsha 410073, China |
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| Cites_doi | 10.1088/1009-1963/16/10/029 10.1364/OL.32.000466 10.1364/JOSAB.24.001707 10.1117/12.736368 10.1364/OE.14.012022 10.7498/aps.55.6464 10.1109/JSTQE.2007.896618 10.1049/el:20057165 10.1117/12.809416 10.1117/12.650138 10.1109/JSTQE.2007.897173 10.1088/0256-307X/26/4/044204 10.7498/aps.57.5627 10.1063/1.2952508 |
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| References | 11 12 Liu L (9) 2007; 6708 14 Jia X J (7) 2007; 16 1 2 3 6 8 Ma Y X (13) 2009; 26 Xiao R (4) 2006; 55 Wang J M (5) 2008; 57 10 |
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| SubjectTerms | Active control Amplifiers Beams (radiation) Coherence Computation Digital Fibre Laser beams Phase control 光纤放大器 数字锁相放大器 相干光束 空间反射镜 输出功率 闭环性能 高功率 |
| Title | Tiled-aperture coherent beam combining of two high-power fibre amplifiers |
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