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Up-conversion luminescence in the Ca3Ga2Ge3O12:Nd3+laser garnet crystal

2000; IOP Publishing; Volume: 12; Issue: 26 Linguagem: Inglês

10.1088/0953-8984/12/26/104

1361-648X

F Ramos-Lara, Daniel Jaque, J. García‐Solé, U. Caldiño G.,

Luminescence Properties of Advanced Materials

The infrared to visible luminescence of the Nd3+ ion in the Ca3Ga2Ge3O12:Nd garnet crystal at different Nd concentrations has been investigated in the excitation spectral range corresponding to diode pumping (720-840 nm) under continuous wave and pulsed pumping. Three visible bands centred at 541, 601 and 677 nm were observed, these emissions mainly departing from the excited state 4G7/2. By using a simple rate equation model to fit the experimental data, it was possible to infer that this excited state is populated via up-conversion energy transfer between Nd3+ ions in the garnet crystal.