Dear Alim, about Your question I would say following. Absorption band of solid state material is determined by quantum mechanical selection rules (that reflect relative conservation lows). Therefore states of polarization and spectral width of light and symmetry and origin of energy level will be together form general pattern of absorption band. Most simple example we meet in the cases of the linear and circular dichroism: change state of polarization and observe the distinct evident change of absorption band. More complicated physically effect Davidov's splitting in molecular crystals when absorption band includes 2 orthogonaly polarized absorption bands. Exist forbidden transitions due to spin transitions, fordidden one-photon transitions due to symmetry levels but allowed as 2-photon and it ought to change photon energy and set-era.