Theoretical analysis of fiber lasers emitting around 810 nm based on thulium-doped silica fibers with enhanced 3H4 level lifetime

We investigate performance of compact thu- lium-doped fiber laser at 810 nm in three diffe- rent hosts: ZBLAN, standard silica and silica modified by high alumina codoping. We found that efficient lasing at 810 nm in silica should be possible for short ranges of fiber parameters, especially when 3H lifetime is enhanced.