Phase locking and supermode selection in multicore photonic crystal fiber lasers with a large doped area.
We report on the laser properties of multicore photonic crystal fiber lasers. A stable phase locking of six- and seven-core structures through evanescent coupling is observed. Effective supermode selection is obtained by using both diffraction losses and the Talbot effect. A pure in-phase supermode is obtained (1.1 times diffraction limited). The laser operating in this mode has a slope efficiency of 70% with up to 44 W of output power. The modal area of the in-phase supermode multicore fiber is 1150 microm2, which makes it, to our knowledge, the single-mode fiber laser with the largest mode field area. In-phase laser action is stable when the fiber is bent.
Michaille
L
L
QinetiQ Malvern, St. Andrews Road, WR14 3PS Great Malvern, UK. lfmichaille@qinetiq.com
Bennett
C R
CR
Taylor
D M
DM
Shepherd
T J
TJ
Broeng
J
J
Simonsen
H R
HR
Petersson
A
A