No abstract

A computer simulation of the Er'+ 3-pm crystal laser considering the full rate-equation scheme up to the F7/2 level has been performed. The influence of the important system parameters on lasing and the interaction of these parameters has been clarified with multiple-parameter variations. Stimulated emission is fed mainly by up-conversion from the lower laser level and in many cases is reduced by the quenching of the lifetime of this level. However, also without up-conversion a set of parameters can be found that allows lasing. Up-conversion from the upper laser level is detrimental to stimulated emission but may be compensated by cross relaxation from the S3/2 level. For a typical experimental situation we started with the parameters of Er'+:LiYF4. In addition, the host materials Y3A150» (YAG), YA103, Y3Sc2A130» (YSGG), and BaY&F8, as well as the possibilities of codoping, are discussed. In view of the consideration of all excited levels up to F7/2, all lifetimes and branching ratios, ground-state depletion, excited-state absorption, three up-conversion processes as well as their inverse processes, stimulated emission, and a realistic resonator design, this is, to our knowledge, the most detailed investigation of the Er'+ 3-pm crystal laser performed so far.PACS number(s): 42.55. Rz, 42.60.Lh, 78.45.+h

No abstract

We report on an erbium cascade laser in a fluorozirconate fiber. Lasing on the transition 4I11/2→4I13/2 at 2.71 μm is supported by colasing on the transition 4S3/2→4I9/2 at 1.72 μm. This recycles the excitation that is lost via excited-state absorption and avoids the saturation of the output power. Threshold at 2.71 μm is 33 mW launched pump power at 791 nm. The measured slope efficiency of 22.6% is relatively close to the 29.1% stokes-efficiency limit. An output power of 158 mW is obtained, limited only by the 1.43 W power available from the Ti: sapphire pump laser. Output power is 15 and slope efficiency 2.5 times higher than reported in previous publications.

No abstract

No abstract

No abstract

No abstract