The absorption, fluorescence decay and stimulated emission properties of several multiply doped laser crystals including (Er, Nd):YAG and (Cr, Er, Nd):GSGG are investigated. The presence of different laser ions in one crystal host results in strong ion-ion interactions and energy transfer among these ions. Consequently, both fluorescence decay and lasing characteristics of one kind of laser ions are strongly affected by the presence of the other. Simultaneous lasing of both Er+3 (2.94 μm) and Nd+3 (1.06 μm) ions has been obtained from the codoped laser crystals.
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