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!

Learn more about AOM CGHs.