ULTRA-HIGH POWER FIBER LASER SYSTEM WITH MULTIMODE-MULTIMODE FIBER COMBINER

摘要

An ultra-high power fiber laser system includes a multimode combiner which is configured with a plurality of low mode fibers bundled together and tapering toward its downstream end. A clad mode absorber extends along the tapered downstream end and over a portion of the combiner's output fiber. The absorber is configured with adjacent zones which are provided with respective refractive indices. In a forward propagating direction of signal, the upstream zone includes polymeric material with the refractive index higher than that of the cladding of the combiner end fiber. The intermediate zone includes polymeric material configured with a refractive index lower than that of the cladding of the combiner output fiber. The downstream zone is configured with polymeric material having a refractive index lower than that of the cladding of the combiner output fiber and impregnated with a plurality of light diffusers.