3D holographic smart phones? Not so fast

Star Wars: 3D hologram phones like those seen in 1977 blockbuster will be on market within five years – Mirror Online.

These are not holograms but stereoscopic images projected onto a stream of vapor creating 3D appearance.

A true hologram is based on the phase interference pattern created by two laser beams – one bouncing off a subject and the other going directly to the film. The interference or diffraction pattern between the bounced laser and the direct laser is then recorded on film. An identical laser to the recording laser is then projected onto the film, turning the diffraction pattern back into an image. Think of the film as acting like an incredibly fancy filter – narrow wavelength laser light hits the filter and then scatters in to the original image.

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