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Coherent and incoherent combining of fiber array with hexagonal ring distribution
Authors:Yongzhong Li  Liejia Qian  Daquan Lu  Dianyuan Fan  Shuangchun Wen
Institution:aState Key Laboratory for Advanced Materials and Devices, Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China;bCollege of Computer and Communication, Hunan University, Hunan 410001, China
Abstract:Beam combining of fiber array with hexagonal ring distribution is studied in detail. The theoretical analysis and numerical calculation results are given to illustrate the propagation properties of the resulting beam through free space. A comparison between the coherent and the incoherent case shows that high peak irradiance and good beam quality for coherent combining can be obtained in the far field. The effect of phase errors and the beam quality M2 factor are also studied. Results indicate that the element numbers should be increased to achieve high power and the space between adjacent elements should be reduced to maintain good beam quality, which is basically the same for both coherent and incoherent beam combining.
Keywords:Beam quality  Coherent combining  Fiber array
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