Monolithic all-glass pump combiner scheme for high-power fiber laser systems

Abstract

We report on an integrated all-glass pump combiner for ytterbium-doped high power fiber lasers. The combining of multiple pump fibers with an active double clad fiber for high power amplification was successfully achieved by splicing them to a dichromatically coated planar convex lens. The measured coupling efficiency of such a combining scheme was typically in excess of 80%, with 86.5% achieved in maximum. Theoretical analysis is discussed in order to get optimized parameters and to consider the scaling of this type of coupler to higher average powers.

High-Power Passive Fiber Components for All-Fiber Lasers and Amplifiers Application—Design and Fabrication

“…The pump power combiner in N × 1 configuration is used when N pump sources (typically with an MM fiber) have to be combined into one output fiber [17,25,[47][48][49][50]. The lack of a feed-through signal fiber simplifies the design and fabrication process of this component.…”

Applications of High Power Semiconductor Lasers

“…There is N + 1 fibers to be fused, in which N denotes number of pump fibers and "1" denotes one doped fiber. Before fusing, the coating layers of pump [27] fibers and the doped fiber should be stripped. Then the N fibers of pump sources are arranged around doped fiber as shown in Fig.…”

High-power pump combiners for Tm-doped fibre lasers

“…However, appli− cation of this method to the laser setup makes the construc− tion very complicated, sensitive for external factors and requires the use of a precise optical and mechanical adjust− ment. In 2010 Jun Ki Kim and co−workers presented an all−glass pump combiner with the coupling efficiency ex− ceeding 80% [29]. In their approach, the pump combiner consists of multiple pump fibres and an active double−clad fibre spliced to a di−chromatically coated planar convex lens.…”