en ادوات اپتیکی و اندازه‏‌گیری‏‌ها Optical Devices and Measurements پژوهشي Research <span style="font-size:11pt"><span new="" roman="" style="font-family:" times=""><span style="font-weight:bold"><span style="color:#000000"><span style="font-style:normal"><span style="white-space:normal"><span style="text-decoration:none">In this paper, Laguerre-Gaussian beams are produced by Computer Generated Hologram (CGH) on Spatial Light Modulator (SLM). The realization of CGH on SLM is simulated by the scalar diffraction theory. At first, Laguerre-Gaussian beam generation process is simulated by diffraction of laser light from phase and amplitude fork gratings in two types: blazed and binary grating and the results are compared. The higher efficiency is obtained for the blazed phase grating in the first order which is more important in our study. Recorded data from the experiment shows a good agreement with simulation results. In order to evaluate the topological charge of the generated Laguerre-Gaussian beam, the Mach-Zehnder interferometer setup is used.</span></span></span></span></span></span></span> Binary and blazed Grating, Computer generated Hologram, Laguerre-Gaussian beam, Spatial Light Modulator. 171 176 http://ijop.ir/browse.php?a_code=A-10-208-1&slc_lang=en&sid=1 Shakiba Mosavat Shahreza shakibamosavat@gmail.com 10031947532846004672 10031947532846004672 No Optics and Laser Science and Technology Research Center, Malek-Ashtar University of Technology, Isfahan,Iran Seyed Ayoob Moosavi ayoobm63@gmail.com 10031947532846004673 10031947532846004673 No Optics and Laser Science and Technology Research Center, Malek-Ashtar University of Technology, Isfahan,Iran Hossein Saghafifar saghafifar1@yahoo.com 10031947532846004674 10031947532846004674 Yes Optics and Laser Science and Technology Research Center, Malek-Ashtar University of Technology, Isfahan,Iran