Résumé
We report here on the study of the theoretical optical properties of Ga based nitrides systems. The dipolar matrix elements and hole effective masses are presented as a function of the reciprocal wavevector for strained bulk GaN. We compute then the A, B and C exciton binding energies for strained GaN/Al
0.2Ga
0.8N quantum structures and present the calculated optical density for a 50 Å wide well.