"This thesis deals with a method for the characterization of a spatial light modulator SLM using interferometry and polarization. A liquid crystal SLM display can alter the phase and amplitude of an incoming laser beam. It can be used to shape an incident beam into almost any arbitrary exit beam. However, an LCoS-SLM presents some negative effects: temporal fluctuations in phase and amplitude. These fluctuations are known as flicker. The first part of this thesis introduces the basic concepts for an SLM and presents a review of some methods to characterize an SLM. This work shows experimental results of the proposed method with a Twyman-Green interferometer that uses polarized incident light and a commercial reflective LCoS-SLM. Furthermore, a computer model to analyze the accuracy of the proposed method was realized. Finally, the behavior of the flicker in an LCoS-SLM for different polarization schemes and temperatures is observed."