Experimentos simples demostrando algunas propiedades de lentes   difractivas y redes espirales
  We introduce some new experiments where light diffraction is demonstrated with simple elements: white light diffraction with a coin, construction of a diffractive lens by holography, diffraction properties in digital discs and an interesting experiment that generates images with them. This experiments lead to the idea of a new optics that is entirely diffractive, which is a trend in development for its construction facilities, weight reduction and other benefits it causes. 
Jose J. Lunazzi, Daniel S. F. Magalhaes, Maria C. I. Amon, Noemi I. R.   Rivera