Yb‐doped large‐mode‐area aluminosilicate laser fibre fabricated by chelate precursor doping technique. Issue 23 (1st November 2016) - Peng, Kun
Abstract : A modified chelate precursor doping technique using high‐purity materials and accurate gas flow control system is proposed to fabricate an efficient ytterbium‐doped large‐mode‐area silica fibre for laser development. This technique enables to make homogeneous large‐core preform with symmetrical shape, relatively low numerical aperture of ∼0.06 and large‐core size of over 4 mm. Homemade preform was drawn into standard fibre for testing and fully characterised by electron probe microanalysis and time‐of‐flight secondary ion mass spectrometry. On the basis of two‐stage master oscillator power amplifier system, 1 kW laser output with slope efficiency of 81.0% was realised at ∼1064 nm.