How does a hologram work? (in 1 minute)

1. Interference fringes record the direction of light that was scattered by an object.
2. When illuminated, the recorded interference fringes act as diffraction gratings, which reproduce the direction of the scattered light.
3. By exactly reproducing the light field (i.e. both intensity and direction) that was scattered by the object, it is as if we see the actual object.

[AndreSHoek]

I've watched like 20 videos on this topic, and this is the first time I understand the concept fully, and in under a minute, great stuff!

[ckworton]

Well that was the shortest and best description ever! Thank you.

[Remyie]

Wow finally a video that actually SHOWS how it works, thank you 👍

[optiondrone]

excellent explanation more videos on inline digital lens less holography please. I have real difficulty understanding resolution in x-y axis vs z axis from an angular spectrum point. Meaning when in inline DHM we're using ASP to reconstruct the actual image how x-y axis resolution and z axis resolution are related. Also how can we get a different perspective of a given amplitude image using its corresponding phase information? Meaning how can we look at corners rather than only perspective available (top down) from amplitude image? Thanks

[mybluemars]

A hologram is not actually 2D. It is a 3D object with thickness which is required to create the hologram. Why is this not mentioned in any videos I can find on the subject?