We present a novel mirror geometry combining the two features of phase locking and simultaneous beam shaping of the emission of a multicore fiber (MCF) laser. In the experiments we applied a Talbot cavity to a diode-pumped MCF laser with 18 microcores placed on a ring. The feedback mirror consisted of a highly reflecting structure with 18 spokes and a circle in the center deposited on a glass substrate. The spokes increased the discrimination between the supermodes and suppressed independent lasing of the individual emitters. The central dot caused strong diffraction of the output radiation, leading to a shaped beam profile. The output power of the phase-locked MCF laser exceeded 5 W.
© 2001 Optical Society of America
(050.1940) Diffraction and gratings : Diffraction
(140.3290) Lasers and laser optics : Laser arrays
(140.3410) Lasers and laser optics : Laser resonators
(230.5750) Optical devices : Resonators
(260.1960) Physical optics : Diffraction theory
M. Wrage, P. Glas, and M. Leitner, "Combined phase locking and beam shaping of a multicore fiber laser by structured mirrors," Opt. Lett. 26, 980-982 (2001)