A kind of target-in-the-loop (TIL) technique which promises the coherent combination of multi-element laser beams in far field is experimentally demonstrated. The physical model of coherent beam combination (CBC) based on TIL is established. A kind of adaptive fiber optics collimator correcting piston and tip/tilt errors simultaneously is employed to compensate phase errors between beamlets. The CBC of a 3-element fiber array based on TIL is successfully achieved and a perfect effect of CBC is captured. In this paper, we present a reference for long-distance transmission of multi-element coherent beams in real atmospheric environment.
1.Chinese Acad Sci, Key Lab Adapt Opt, Chengdu 610209, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Geng Chao,Li Xin-Yang,Zhang Xiao-Jun,et al. Experimental investigation on coherent beam combination of a three-element fiber array based on target-in-the-loop technique[J]. ACTA PHYSICA SINICA,2012,61(3).