The generation of high-power, broadband supercontinuum spanning from visible to mid-infrared via incoherent beam combination in a GeO ₂ -core fiber bundle

In this work, we experimentally demonstrate a high-power supercontinuum (SC) that covers from visible to mid-infrared (MIR) in a GeO2-core fiber (GCF) bundle via incoherent beam combination.In the experiment, the SC generation in a single GCF was initially explored, obtained a SC spanning from visible to MIR regions, with average power of less than 10 watts.To increase the output power, we fabricated a 31 high-power GCFbased tapered fiber bundle (H-GTFB), incoherently combining three channels of the previously mentioned replicas.This yielded a broadband SC spectrum with a maximum average power of 23.1 W and a spectral bandwidth covering 0.73 to 3.1 m.The obtained spectrum power fluctuation was measured over one hour, showing a root mean square (RMS) value of 0.7%.To the best of our knowledge, this represents the highest power SC from visible to MIR regions obtained in GCFs pumped by 1.55 m high-power pulses.