Influence of saturable absorbers on fiber ring laser sensors
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AuthorRodríguez Cobo, Luis; Quintela Incera, María Ángeles; Ruiz Lombera, Rubén; Pérez Herrera, Rosa Ana; López-Amo Sainz, Manuel; López Higuera, José Miguel
In this work, a fiber ring laser sensor has been employed to analyze the influence of passive Er-doped fiber acting as saturable absorber. Lasing modes of fiber ring lasers can be reduced by properly locating a saturable absorber that narrows the spectral width of the FBG that selects the lasing wavelength. Employing commercial Er-doped fiber, different configurations have been evaluated, reaching the SLM regime on a ring cavity of several meters. Thus, the achieved strain response of the whole sensor behaves at its mirror FBG, exhibiting linear response to strain.