Power Scalable and Efficient 790nm pumped Tm~(3+)-Doped Fibre Lasers

摘要

This paper presents a discussion of the engineering issues and results of high power 2μm Tm~(3+)-doped fibre lasers pumped at 790nm. To date we have achieved up to 85W from such devices with 54% slope efficiency relative to launched pump. More recently, through using Tm~(3+) concentrations of approximately 4(wt.)% to enhance the cross-relaxation process (~3H_4, ~3H_6 → ~3F_4, ~3F_4) we have demonstrated slope efficiencies of up to 67% relative to launched power. This represented ～ 170% quantum slope efficiency for the 790nm pumped 2μm laser.