The diffraction efficiency behavior of the holographic gratings recorded in photopolymers is due to several parameters
such as the monomer concentration, the dye quantity, etc. It has been reported that the absorption in photopolymers
depends of the beam intensity employed to record the holographic gratings, polymerization velocity, humidity,
temperature, etc. In this work we present a theoretical model of the diffraction efficiency behavior of holographic
gratings recorded in Norland Optical Adhesive No. 65 mixed with crystal violet dye as function of the temperature and
the power of the recorder beam. The model is compared with some experimental results.