RESUMO
With the development of microfabrication technology, it has become possible to modulate the optical wavefront with high accuracy by a device such as a liquid crystal spatial light modulator (SLM). In this study, we conducted a theoretical analysis and experimental study on the generation of Laguerre Gaussian beam of vortex light wave using phase modulation SLM. Numerical simulation and experimental results on the generation of Laguerre Gaussian beam by both binary and phase only modulation are discussed based on the angular spectrum method and the Fresnel transformation method in hologram (CGH) diffraction. The experimental results show that Fresnel diffraction calculation based on Fourier transform method can simulate the light diffraction of SLM very well. This method is very suitable for the action simulation of digital optical wavefront control devices such as SLM. It can be imagined that the simulation method in this study can also play an important role in the design and development of digital optical diffraction elements.