Computer-generated hologram
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A computer-generated hologram is a holographic interference pattern that is generated by a computer.
It can be displayed using an SLM.
It can be generated using the Gerchberg-Saxton algorithm (GS algorithm).
There are multiple types of CGH: Phase mode and amplitude mode. Both methods traditionally use a laser as the light source, giving coherent light. This is to line up the wave troughs and peaks.