Multi-dimensional wavefront manipulation of phased fiber laser array for coherent beam combining in finite-distance conformal transmission
OPTICS AND LASER TECHNOLOGY(2024)
Abstract
We demonstrate the principle of generating the approximate spherical convergent light waves by wavefront manipulation for conformal transmission and coherent beam combining (CBC) based on a phased fiber laser array (PFLA) under finite transmission distance. The CBC by target-in-the-loop is investigated on the Easylaser software, revealing the theoretical relationships between the central-lobe energy of CBC and the phase manipulation method, transmission distance, and array scale. The CBC experiments are operated based on the 19element and 57-element PFLA in the 2 km real atmosphere where the clear-fringe contrast is 0.90 and 0.79, respectively, and the central-lobe energy of the CBC increased about 13.5 times and 26 times, respectively. These results validated the conformal transmission's contribution to efficient CBC and central-lobe energy increase. This work may not only present new understandings of the CBC of large-scale PFLA from the aspect of manipulating the wavefront but also provide new methods for the applications in any size of PFLA under any applying distance.
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Key words
Phased fiber laser array,Conformal transmission,Wavefront manipulation,Coherent beam combining,Turbulence mitigating
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