Abstract
Multicore fiber lasers (MCF) are advantageous designs for diode pumped high power (>10 W) short length (<100 cm) lasers. We have realized a circular array containing 18 Nd-doped microcores on a ring inside a large pump core of lower refractive index. A disadvantage of such an array is the bad beam quality due to the lack of coherence between the individual lasers. Recently, phase-locking of MCF’s has come to prominence using the Talbot concept. The resonator scheme is shown in Fig. 1. The space between the fiber end-face and the mirror is filled by an annular waveguide (AW). The coupling mirror attached to the AW couples light effectively back into the lasing apertures, provided the emitters in the array are mutually coherent among each other. The reflection into the apertures is best described by the coupling coefficient (amplitude reflection coefficient).
© 2002 Optical Society of America
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