3D image projection using large diffractive screens

摘要

Holographic screens were previously reported by one of the authors (J. J. L.) as a means of keeping parallax when projecting images of objects and holophotographs. The images formed in that way offer stereoscopic vision to the audience, without the help of glasses, but in addition to that they offer color encoded continuous parallax effects when the onlooker changes position along a horizontal track. First, we report on the manufacture and use of diffractive screens of dimensions up to 1.14 m $MUL 0.75 m that show all of the previous reported abilities. They were made by means of a ruby laser. In the next section a number of possible uses of those screens are presented, going from diffraction encoded projection of photographs, over real object projection, to transmission and reflection holograms. Magnifications by a factor of 20 were possible.