Abstract: In a te tragonal strong-field approximation, the optical spectra in the vicinity of substitutional Co²⁺ impurities in SrLaA10₄ compound is investigated by means of Zhao'S Semi—SCF d-orbit Wave Functions model of free Co₄ ions. It is found that the transition 18830 cm^-1 is nota two—electron transition but ⁴E(⁴T₁, e²t₂⁵) to ground state, Good agreement between the results and the experimental findings is attained.