This course will first briefly review Fourier optics and basic concepts of holography. The emphasis will then be geared towards to the understanding of a 3D imaging technique in which 3-D holographic information of an object can be extracted by a single 2D scan of a structured-laser beam. Such a technique is called optical scanning holography, which is a form of digital or electronic holography. Potential applications of optical scanning holography include 3D holographic fluorescence microscopy, holographic information transmission and TV systems, 3D scanning cryptography, 3D optical remote sensing, and 3D holographic display.