Abstract
We present a fiber laser made in a single piece of conventional doped-core fiber that operates by combined feedback of the fundamental core mode and the high-order cladding mode . The laser is an all-fiber structure that uses two fiber Bragg gratings and a long-period grating to select the modes circulating in the cavity; the laser emits at the coupling wavelength between the core mode and the counterpropagating cladding mode in the Bragg gratings. This work demonstrates the feasibility of high-order mode fiber lasers assisted by long-period gratings.
© 2011 Optical Society of America
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