The Nd-Nd and Nd-Yb energy transfer processes are studied in lead fluoroind
ogallate glasses with the following molar composition: 30PbF(2)-20GaF(3)-15
InF(3)-15ZnF(2)-(20-X)CaF2-XNdF3 (with X=0.1, 0.5, 1, 2, 4, and 5), 30PbF(2
)-20GaF(3)-15InF(3)-15ZnF(2)-(20-X)CaF2-XYbF3 (with X=0.1, 0.5, 1, 2, 3, an
d 5), and 30PbF(2)-20GaF(3)-15InF(3)-15ZnF(2)-(19-X)CaF2-XYbF3-1NdF(3) (wit
h X=0.1, 0.5, 1, 2, 3, and 5.5). The Dexter, Yokota-Tanimoto, and Holstein
formalisms were used to treat the experimental data. The following micropar
ameters of energy transfer were obtained: C(DD(Nd-Nd))approximate to 7x10(-
40), CDA(Nd-Nd)=2.5x10(-40), and C(DA(Nd-Yb))approximate to 3x10(-40) cm(6)
/s. It was also shown that the energy migration between Nd ions depends on
the third power of temperature (T-3) up to a saturation value of about 80 K
. This behavior was attributed to the site to site energy migration. The Yb
doped samples presented no nonradiative losses for the Yb3+ emission at 96
9 nm. (C) 2001 American Institute of Physics.