How is a CGH different from other types of holograms?
A CGH differs from other types of holograms in the way it creates the holographic image or wavefront:
A “traditional” analog CGH uses interference of light from a real object with a reference beam to create a diffractive structure.
A CGH does not record the interference pattern of light waves from a real object but rather uses a computer to calculate and generate a digital pattern that can produce the desired image or wavefront.
Because it does not require a real object or reference beam, a CGH could represent any type of wavefront, real or imagined!