We report laser operation at 1.81 mu m and 1.85 mu m in a Tm3+:LiNbO3
Ti-diffused waveguide doped by thermal indiffusion at high temperature
. We believe this is the first time lasing has been seen in Tm:LiNbO3
at room temperature, Continuous-wave operation was achieved at room te
mperature with a threshold of 42 mW launched pump power. The output po
wer was observed to be stable, without any sign of photorefractive dam
age.