Upconversion Laser Action in Pr3+-Doped ZBLANP Fiber Pumped by an Yb-Doped Silica Fiber Laser

Laser action at 491, 520, and 635nm from Pr3+-doped ZBLANP fibre is reported for pumping at 840 and 1020nm with the output of an 840nm-pumped Yb-doped silica fibre laser.