Optical multi-sites of Nd3+-doped CaMoO4induced by Nb5+charge compensator

Site-selective laser excitation and luminescence measurements at 15 K of CaMoO 4 single crystal doped with Nd 3+ and co-doped with Nb 5+ charge compensator have been investigated in the spectral region of laser interest involving the transition. A larger than expected number of Nd 3+ sites was found and a model to explain this result is presented. A partial diagram of 4 F 3/2 and 4 I 11/2 levels was constructed from the acquired data and their features are discussed.