At high Tb~(3+) concentration the green emission of Tb~(3+) due to 5D4→7FJ transitions dominated the emission spectra, which could be attributed to the cross-relaxation process.

The results are explained qualitatively by the cross relaxation model of ion pair and the fiber nonlinearity stimulated Brillouin scattering.

8 μm emission and the cross-relaxation mechanism are discussed.

0 μm is generated through two processes:the cross-relaxation between Tm3+,and the holmium particles population to 5I7 via the energy transfers from Tm3+ to Ho3+.

8 μm emission with the pump power prove that the particle number in 3F4 comes from the cross-relaxation process of 3H4+3H6→23F4.

Theoretic estimation of lasing threshold of a three-level systsm containing cross relaxation;

Results of meausred radioluminescence spectra show that energy transfer mechanisms occurring from Gd~(3+) cations towards Tb~(3+) emssion centers as well as the cross relaxation among Tb~(3+) cations within the certain concentration range exert tremendous effects on the emission intensity of glasses.

Its found that the energy match between rare earth ions is realized easily by the phonon joining at room temperature,which result to cross relaxation strengthen and the lifetime of 664 nm radiation be longer.

Orientational relaxation of C_(60) researched by extremal dynamic model;

The equation describe the existences of the resonance states and the relaxation.

And we will study the influence of the quantum dimsension effect to the relaxation construction in the item.