Lasing characteristics of Tm3+: Ho3+ codoped silica fibre laser pumped by 1.18-mu m Raman fibre laser

摘要

The fundamental characteristics of Fabry-Perot-cavity continuous-wave Tm-Ho codoped silica fibre lasers pumped by a 1.18 mum Raman fibre laser are presented. A maximum output power of 930mW at 1880nm is generated for a fibre length of 1 in from the transition of Tm3+, with a slope efficiency of 32.4%. For a 3-m-long fibre, the maximum output power decreases to 650 mW at 1960 nm due to the laser emission from Ho3+ with a lower slope efficiency of 25%; which clearly shows the effective energy transfer from Tm3+ to Ho3+. The wavelength red-shifting of the laser emission originates from the transition competition and the emission cross section difference between Tm3+ and Ho3+.