Influence of saturable absorbers on fiber ring laser sensors

Open Access

Abstract

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. ; This work has been supported by the project TEC2013-47264-C2 and TEC2016-76021-C2, of the Spanish government and by a Parliament of Cantabria postdoc grant.