cw fiber laser of NdLa pentaphosphate

Abstract
Cw operation at 1.051 μm of a waveguide laser consisting of a crystalline fiber of Nd0.5La0.5P5O14, 12×12 μm in cross section and 0.68 mm in length, is reported. When longitudinally pumped with a Kr ion laser at 752.5 nm the room‐temperature laser threshold was less than 10‐mW absorbed power.