We have presented absorption spectra related to octahedrally
coordinated Co2+ in the Sr2+ position in
SrLaGa3O7. Quantitative analysis of the line shape of the
4T1→4T2 transition shows the existence of the
strong T⊗τ Jahn-Teller effect in the
4T1 ground state of the system. We have estimated the
Jahn-Teller stabilization energy to be equal to 507 cm-1. The
procedure of estimation of the crystal-field strength parameter
10Dq for the system that is affected by the strong Jahn-Teller
coupling has been discussed.