[en] Modifications of the spectral dependences of the optical absorption induced in the Bi₁₂TiO₂₀:Al crystal as a result of sequential exposition to cw laser radiation first with the wavelength λ_g = 532 nm and then with the longer wavelength λ_l,n = 588, 633, 655, 658, 663, 700, 780, 871, or 1064 nm are investigated. We revealed that after the short-wavelength exposition to radiation with λ_g = 532 nm, the optical absorption in the crystal increases, and in the range 470–1000 nm, yields the spectrum whose form is independent of a prehistory. The subsequent exposition to longer-wavelength radiation leads to bleaching of the crystal in the examined spectral range. A maximum diminishing of the optical absorption in the crystal is observed upon exposure to radiation with the wavelength λ_l,5 = 663 nm. To describe the experimentally observed reversible changes in the optical absorption spectrum in the Bi₁₂TiO₂₀:Al we use the impurity absorption model that takes into account the photoinduced transitions between two metastable states of a deep defect center leading to the change of its position in the crystal lattice under conditions of strong lattice relaxation. (paper)