Efficient CW operation of a 2.71 mu m Er,Pr:ZBLAN double-clad fibre laser p
umped with a single diode laser operating at a wavelength of 975nm is descr
ibed. A maximum output power of 0.5W and a slope efficiency of 25% (with re
spect to the launched pump power) were obtained. Threshold pump powers of <
200mW launched were measured and consistent relaxation oscillations in the
output from the fibre laser indicate the presence of a saturable absorption
mechanism.