فهرست نشریات علمی دسترسی آزاد ایران

In this paper, the optimal Fresnel lenses are designed by Zemax software.The fundamental problem of the Fresnel lenses is the beam divergence, which wasresolved by decreeing the output stain diameter on the image plane. For this purpose,two types of radial and cylindrical Fresnel lenses are simulated with different groovesusing Global and Hammer optimization methods. The minimum output stain diameter inradial and cylindrical modes are computed for Fresnel surfaces and differentcomponents of the Fresnel lenses. The Results show that the Fresnel lenses have aspherical and distortion aberration. By optimizing the optical system with the Globaland Hammer methods, the output stain diameter can be controlled and the beams arefocused. Numerical results and conclusions are given in our paper by changing thedistance between the elements, radius, material, height, depth and width