The authors report a highly-efficient, short, robustly single-frequenc
y and linearly polarised Er3+:Yb3+ codoped fibre laser with fibre-grat
ing Bragg reflectors. An output power of 19mW for 100mW of 980nm diode
pump power and a slope efficiency relative to a launched pump power o
f 55% is demonstrated. The RIN of the laser was < -157 dB/Hz and the l
aser linewidth was 300kHz.