Caltech team encodes two holograms on one surface
Caltech engineers have encoded two holographic images on a single surface without any loss of resolution, said to overturn a long-held assumption that a single surface could only project a single image. The hologram, when illuminated with a straight laser, projected a Caltech logo. However, on a 30Âº angled illumination, it projected another logo of LMI (Light-Material Interactions) research group.