A. V. Malov, P. A. Ryabochkina, A. V. Popov, E. V. Bolshakova, “Interaction of Er<sup>3+</sup> ions in Er-doped calcium — niobium — gallium garnet crystals”, Kvantovaya Elektronika, 2010, Volume 40, Number 5,Pages <nobr>377

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Interaction of Er³⁺ ions in Er-doped calcium — niobium — gallium garnet crystals

A. V. Malov^a, P. A. Ryabochkina^a, A. V. Popov^b, E. V. Bolshakova^a

^a Ogarev Mordovia State University
^b Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow

Abstract: The processes of nonradiative energy transfer in calcium — niobium — gallium garnet (CNGG) crystals doped with Er³⁺ ions are studied. It is found that the energy of erbium ions in the Er:CNGG crystal with the erbium atomic concentrations C_Er=6% and 11% is transferred via the nonradiative co-operative processes ⁴I_11/2→ ⁴I_15/2, ⁴I_11/2→ ⁴F_7/2, ⁴I_11/2→ ⁴I_15/2, ⁴I_13/2→ ⁴F_9/2; and ⁴I_13/2→ ⁴I_15/2, ⁴I_13/2→ ⁴I_9/2, whose efficiency increases with increasing intensity of exciting radiation. It is shown that the cross-relaxation processes ⁴S_3/2→⁴I_9/2, ⁴I_15/2→⁴I_13/2, whose intensity depends on the concentration of Er³⁺ ions, are characteristic for Er:CNGG crystals with the Er atomic concentration above 1%.

PACS: 42.55.Rz, 42.70.Hj, 32.50.+d

Received: 26.02.2010
Revised: 30.03.2010