Abstract
Passive mode locking of fiber lasers in the figure-eight 1 and the ring 2 configuration have been reported. Coupled-cavity mode locking of fiber lasers by using bulk optics has also been reported.3 We report, for the first time to our knowledge, the generation of very stable mode-locked laser pulses from an in-line coupled-cavity fiber laser by using three intracore Bragg gratings. The theory of passive mode locking is well understood.4-6 Using the nonlinear model of a coupled cavity with a nonlinear index, we constructed two in-line coupled-cavity fiber lasers, both of which used Er-doped fiber as main laser cavity and a nonlinear silica fiber of the same length as the auxiliary cavity. Two intracore Bragg gratings were used to form the main cavity, and a third intracore Bragg grating was used to form the coupled cavity.
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