Fiber laser with combined feedback of core and cladding modes assisted by an intracavity long-period grating.
OPTICS LETTERS 2011;
36:1839-1841. [PMID:
21593908 DOI:
10.1364/ol.36.001839]
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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 LP((0,1)) and the high-order cladding mode LP((0,10)). 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 LP((0,1)) and the counterpropagating cladding mode LP((0,10)) in the Bragg gratings. This work demonstrates the feasibility of high-order mode fiber lasers assisted by long-period gratings.
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