Spectral beam combining of 2.8 μm fiber laser based on telescope system

Abstract

Abstract We reported a spectral beam combining (SBC) of 2.8 μm erbium-doped fluoride glass fiber laser based on a telescope system. The application of the telescope system compressed the spectra of SBC significantly and allowed more fiber lasers to be combined. The SBC of three fiber lasers with a beam combining the efficiency of 68% was demonstrated. This work shows the ability of SBC in fluoride fiber power scaling.