Abstract

High power Yb-doped monolithic fiber oscillators in principle consist out of an Yb-doped double clad fiber (YDF), Fiber Bragg Gratings (FBGs), fiber coupled pump diodes and a transportation fiber [1]. Here we present a YDF fiber that has been optimized for lowest photodarkening and high average output power. The signal core has been designed and fabricated to match the fundamental mode when spliced to commercial components, e.g. the FBG fibers. However, due to the different fiber core compositions and refractive index profiles, the losses of the spliced fibers need to be minimized in a way that the splice process does not influence the refractive index profiles of the individual fibers to realize mechanically stable, low loss splices.

© 2015 IEEE