Abstract
The codoping of with or ions is shown to avoid the clustering of ions, which otherwise prevent doped to be used for various photonic applications. The breaking of clusters by ions paves the way towards the development of a doped visible laser. On the other hand, the formation of clusters in place of clusters leads to extremely efficient energy transfers between and which could be used for quantum cutting applications. Two types of clusters are observed for both types of codopings. to energy transfer analysis shows that for one of the clusters an ultrafast energy transfer takes place with a rate of , which is likely due to exchange interaction.
©2012 Optical Society of America
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