中国物理B ›› 2010, Vol. 19 ›› Issue (1): 14202-014202.doi: 10.1088/1674-1056/19/1/014202

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Tiled-aperture coherent beam combining of two high-power fibre amplifiers

周朴, 马阎星, 王小林, 马浩统, 许晓军, 刘泽金   

  1. College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • 收稿日期:2009-06-08 修回日期:2009-06-25 出版日期:2010-01-15 发布日期:2010-01-15

Tiled-aperture coherent beam combining of two high-power fibre amplifiers

Zhou Pu(周朴), Ma Yan-Xing(马阎星), Wang Xiao-Lin(王小林), Ma Hao-Tong(马浩统), Xu Xiao-Jun(许晓军), and Liu Ze-Jin(刘泽金)†   

  1. College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China
  • Received:2009-06-08 Revised:2009-06-25 Online:2010-01-15 Published:2010-01-15

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摘要： 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.

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 be BQ = 1.48. The whole system in closed-loop performs well in a long-time observation.

Key words: coherent beam combination, multi-dithering, tiled-aperture

中图分类号:  (Fiber lasers)

  • 42.55.Wd
42.60.Fc (Modulation, tuning, and mode locking) 42.81.Wg (Other fiber-optical devices)