Abstract
The frequency up-conversion, an efficient laser emission and amplification in Er3+:LiAl5O8 phosphors co-doped with Yb3+ and Zn2+ phosphor powders in the 520–560, 640–680 nm regions and at ∼1.5 μm, respectively, have been reported. The emission corresponds to the 2H11/2, 4S3/2→4I15/2, 4F9/2→4I15/2 and 4I13/2→4I15/2 transitions upon direct excitation into the intermediated 4I11/2 level using ∼980 nm radiation from a CW laser. Possible mechanisms involved for the up-conversion processes based on the energy level matching scheme, the pump-power dependence and the dynamical behaviour have been discussed. The effect of the addition of Yb3+ and Zn2+ for the amplification in the 1.5 μm eye-safe telecommunication window has been elaborated and characterized in detail.
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