**1. Introduction**

356 Advanced Holography – Metrology and Imaging

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Parallel to the development and popularization of Internet, the emergence of resources for on-line learning is becoming quite common in all scientific disciplines. Optics is a good example of this telelearning. Today there exist several utilities, which allow to perform virtual experiments in Optics, from a computer connected to the Internet. These web-based tools, usually developed in Java (Carnicer, 2010), are suitable to get a first introduction to the optical phenomenon, but do not allow interaction with real, on-going experimentation in the laboratory. On the other hand, websites with videos of real experiments in Optics are also common (Carreño, 2010), but usually they do not allow interaction of the user via simulation. To match both worlds, a set of software tools has been developed at the University of Alcalá, allowing *virtual* and *physical* laboratory testing of different optical phenomena through the same software platform. Developed in MATLAB (Matlab, 2010), these tools cover different topics in Optics. They are aimed to complement "classical" classroom teaching on engineering studies. Current developments include Diffraction, Radiometry and Photometry, Acousto-Optics interaction, Moiré phenomenon, and Computer-Generated Holograms (CGHs)1. In this chapter, only diffraction-related phenomena will be described.
