Designing the optimal Fresnel lenses by using Zemax software

In this paper, the optimal Fresnel lenses are designed by Zemax software. The fundamental problem of the Fresnel lenses is the beam divergence, which was resolved 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 grooves using Global and Hammer optimization methods. The minimum output stain diameter in radial and cylindrical modes are computed for Fresnel surfaces and different components of the Fresnel lenses. The Results show that the Fresnel lenses have a spherical and distortion aberration. By optimizing the optical system with the Global and Hammer methods, the output stain diameter can be controlled and the beams are focused. Numerical results and conclusions are given in our paper by changing the distance between the elements, radius, material, height, depth and width