Effect of higher order modes of fiber laser on the characteristics of coherent combination
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The 27th Research Institute, China Electronics Technology Group Corporation, Zhengzhou 450015, China
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Received Date:
2008-11-08
Accepted Date:
2009-01-05
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Abstract
In order to study the effect of higher order modes of a fiber laser on the characteristics of coherent combination,the fundamental mode and higher order modes in a double-clad fiber laser were approximated to a linear combination of Laguerre-Gaussian beams.Based on its propagation law,the far field distribution of fiber laser array was obtained with consideration of higher order modes.The peak intensity and fringe visibility of a fiber laser array mixing with higher modes of LP01 and LP11and mixing with higher modes of LP01and LP02 were analyzed respectively.The numerical results show that the peak intensity decreases linearly with LP11 increasing and that the fringe visibility decreases linearly with LP02 increasing.
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