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

doi:10.1088/1674-1056/19/1/014202

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.

Keywords: coherent beam combination multi-dithering tiled-aperture

Received: 08 June 2009
Revised: 25 June 2009
Accepted manuscript online:

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

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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) Tiled-aperture coherent beam combining of two high-power fibre amplifiers 2010 Chin. Phys. B 19 014202

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

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