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In this paper, we have calculated the optical properties of the different polytypes of GaSe lamellar materials. The calculations are based on the DFT method and is performed using the CASTEP code. All optical properties have been studied in a domain that extends energetically from 10 meV to 35eV and have been measured for a polarization // and ⊥ with the c axis. A strong anisotropic was observed, which indicates that the optical properties of the GaSe material are essentially determined by the symmetry of a single layer, exactly by the symmetry resulting from the stacking of the layers. The study of the optical properties of the semiconductor GaSe, shows anisotropic optical behavior. In addition, the absorption starts in the UV-Visible spectral range, the peaks appear in the UV range, which is important for photovoltaic applications. Our results are important and give a great chance to these lamellar materials for wide use and various applications.

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