Effect of GeO2 on the lasing performance of Yb: Phosphate glass fiber

A novel GeO2 modified Yb: phosphate glass with good luminescent properties has been demonstrated. P and PG fibers were fabricated by the stack-and-draw method. An output power of 6.4 W with slope efficiency of 46% was obtained from 40.5 cm long PG fiber, while 40.2 cm long P fiber had an output power of 2.7 W and 34% slope efficiency.