Greetings to all. In my first post, I'll present an idea based on acoustical holography. I intend to design a Holographic projector using sound and laser. The hologram is created by reflecting reference laser light on a vibrating diaphragm matrix. The diaphragms are vibrated by means of piezoelectric material or quartz like material. Every diaphragm projects a piece of a 3D image in a specific space, therefore, for a 1m^3 image for example, 1000 diaphragms make the matrix, each projecting a 10X10X10cm hologram. My biggest problem in this system is: The reflective material to use, the ultrasonic oscillator and the reference laser's power/frequency/color(s) in order to make the hologram visible. (or maybe if that system is even possible to build). Peace!