Theoretical study on the 1180nm laser pumped Tm,Ho co-doped silica fiber laser

Theoretical model of Tm~(3+),Ho~(3+) co-doped silica fiber laser pumped at 1200nm band is established,then its performance is studied by numerical simulation,and the theoretical and experimental results are compared,in order to seek the space to optimize the performance of this fiber laser.The computated output power of 1.14W and 733mW are slightly higher than the experimental values of 930mW and 650mW,respectively,whether radiation occurs only Tm~(3+) between the ~3H_4 and ~3H_6 level(with a fiber length of 1m) or energy transfer takes place between Tm~(3+) and Ho~(3+)(with a fiber length of 3m),with a maximum launched pump power of 3.1W.The computed value is more consistent with the experimental one when energy transfer takes place between Tm~(3+) and Ho~(3+).