The energy transfer phenomenon between Nd~(3+)and Yb~(3+)generates the research interest in Nd~(3+)/Yb~(3+)co-doping,because it provides a straight-forward way to combine the features of Nd~(3+)and Yb~(3+)to develop some potential applications, such as solar cells, high energy pulse and tunable lasers. Substantial research work has been conducted to study the spectroscopic properties of Nd~(3+)/Yb~(3+)in different glasses, crystal and ceramic host materials. However, it is still not very clear about the las...