Abstract
The fiber laser containing 7-core hexagonal structure doped by Yb was suggested and experimentally studied in ref. [1], It was observed that the pattern in the far field at more than 100 W laser power looks like that of the in-phase mode of the structure. Numerical simulations based on 3D Beam Propagation Method (BPM) in [2] have demonstrated that the effect observed in [1] is associated with filtering by spatial configuration of gain in the cores.
© 2007 IEEE
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