Numerical and experimental study on coherent beam combining of fibre amplifiers using simulated annealing algorithm

doi:10.1088/1674-1056/19/2/024207

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%.

Keywords: coherent beam combining simulated annealing laser array stochastic parallel gradient descent

Received: 03 May 2009
Revised: 31 August 2009
Accepted manuscript online:

PACS:	42.55.Wd	(Fiber lasers)
	42.60.Fc	(Modulation, tuning, and mode locking)

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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) Numerical and experimental study on coherent beam combining of fibre amplifiers using simulated annealing algorithm 2010 Chin. Phys. B 19 024207

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Numerical and experimental study on coherent beam combining of fibre amplifiers using simulated annealing algorithm

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