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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Bibliographic Details
Published in:Chinese physics B 2010, Vol.19 (1), p.289-293, Article 014202
Main Author: 周朴 马阎星 王小林 马浩统 许晓军 刘泽金
Format: Article
Language:English
Subjects:
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
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Summary: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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/19/1/014202