A 60 W Tm:YLF Laser with Triple Tm:YLF Rods

A narrow linewidth stable high-power continuous-wave 3.5%Tm;doped LiYF;（Tm:YLF） laser is reported.By using dual F-P etalons and three Tm:YLF rods in a cavity,laser output of;0W at 1907.7nm is obtained with a slope efficiency of 34.8%.The M;factor is found to be;.0 under an output power of 30 W.In addition,the relaxation oscillation and efficiency of the Tm:YLF laser are also studied.The relaxation oscillation of the Tm:YLF laser is improved obviously by setting the ratio of pump beam to oscillating laser beam as;.5:1 and the efficiency is increased in comparison with the ratio of;.3:1.