Study on the output properties of fiber lasers operating near 980 nm

Abstract

In this paper, the output properties of fiber lasers operating near 980 nm are investigated. It is found that the pump threshold increases exponentially with the length and dopant concentration of the active fiber. It is also revealed that the output properties of the 980 nm fiber lasers are more sensitive to the inner cladding diameter of the active fiber than to the core diameter. In addition, it is interesting to find that the side lobe suppression ratio of fiber Bragg gratings has a negligible effect on the output properties only when it is larger than some critical value.