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Schematic of phase locking fiber laser array with a self-imaging resonator and a spatial filter. Pumping system is only shown for one fiber, the other three fibers have same pumping systems.
Calculated beam profiles (a) near the collimators and in the far field for coherent Gaussian beams with various phase relationships between elements. The far-field profiles of symmetric eigenmodes with (b) , defined as out-of-phase mode, and (c) , defined as in-phase mode. (d) is an antisymmetric eigenmode with phase distribution . The dotted lines mark the position for spatial filter for mode control.
The experimental beam profiles of (a) the near field near the collimators, (b) out-of-phase mode, (c) in-phased mode, and (d) antisymmetric eigenmode with phase distribution .
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