Numerical and experimental study on coherent beam combining of fibre amplifiers using simulated annealing algorithm |
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| Authors: | Zhou Pu Ma Yan-Xing Wang Xiao-Lin Ma Hao-Tong Xu Xiao-Jun and Liu Ze-Jin |
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| Affiliation: | College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | We present the numerical and experimental study on
the coherent beam combining of fibre amplifiers by means of simulated
annealing (SA) algorithm. The feasibility is validated by the Monte
Carlo simulation of correcting static phase distortion using SA
algorithm. The performance of SA algorithm under time-varying phase
noise is numerically studied by dynamic simulation. It is revealed
that the influence of phase noise on the performance of SA algorithm
gets stronger with an increase in amplitude or frequency of phase
noise; and the laser array that contains more lasers will be more
affected from phase noise. The performance of SA
algorithm for coherent beam combining is also compared with a widely
used stochastic optimization algorithm, i.e., the stochastic
parallel gradient descent (SPGD) algorithm. In a proof-of-concept
experiment we demonstrate the coherent beam combining of two 1083~nm
fibre amplifiers with a total output power of 12~W and 93%
combining efficiency. The contrast of the far-field coherently
combined beam profiles is calculated to be as high as 95%. |
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| Keywords: | coherent beam combining simulated annealing laser array stochastic parallel gradient descent |
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