Numerical Analysis of Coherent Combination
for Fiber Lasers and Application to Beam Steering¹

Z. M. Huang*, C. L. Liu, J. F. Li, D. Y. Zhang, H. F. Wang, Y. Q. Luo, and Q. Q. Hu

Institute of Fluid Physics, China Academy of Engineering Physics, Sichuan, Mianyang, 621900, China

*e-mail: huangzhimeng@yahoo.com.cn

Received March 15, 2012; published online July 9, 2012

Abstract—A coherent combination model of fiber lasers has been established. The relative beam quality factor
has been introduced and studied as a proper beam quality factor for the combined coherent beam. The distur-
bance of the phase shift, polarization degradation, distribution characteristic, the wave-front aberration and the
tilt error has been numerically studied to investigate their effects on the beam quality. This model has been also
used to analyze the control of beam steering. The results have shown that the impact of the phase shift on the
combination is more serious than that caused by polarization degradation, and the coherence degradation
caused by the phase grating is more severe than that caused by the phase shifter.

DOI: 10.1134/S1054660X12080129

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