omneitySep 2025Strongly recommends
On this very topic, this might be one of my most favorite videos ever single-handedly changing my understanding of holograms: ▶ this video
in “Hololuminescent Display” · View on HN
How are holograms possible?
How are holograms possible? on HackerTube: recommended by 3 Hacker News commenters across 3 separate months, 2024–2025.
3Blue1Brown
Open on YouTubeexplainer · evergreen
3Blue1Brown explains how holograms record a 3D scene on 2D film, using wave diffraction and phase. The video includes demonstrations of several real holograms.
Why Hacker News recommends it
HN commenters call it the best explanation of how holograms work, and one says it transformed their understanding.
- people recommended it
- 3
- separate months
- 3
- strong recommendations
- 1
- discussed on HN
- 2024–2025
“this might be one of my most favorite videos ever single-handedly changing my understanding of holograms”
What HN commenters said
3 Hacker News comments link this video. Each one links back to its thread.
aeonikApr 2025Recommends
Yea I have some ideas, but I haven't found an easy way to implement it yet. The term of art that I'm exploring is called "Holographic Interferometry". Sibling poster gave you a link to regular interferometry. But basically, if you split the laser beam, one goes straight into the camera sensor, and the other off your object, you can do some pretty amazing things. Depending on a lot of little details (The devil is hiding here). I found 3Blue1Brown's explanation to be the best, but less "ready to use". ▶ this video
in “Raspberry Pi Lidar Scanner” · View on HN
injidupOct 2024Recommends
Not to take away the brilliance of what is achieved but I think hologram is the wrong word. This is purely about caustics. Amplitude engineering rather than phase. The calculations are just assuming light as particle, not light as wave. A true hologram uses diffraction grating effects and the phase difference from light. There was a very nice explanation on three-blue-brown recently. ▶ this video I don't think there are any phase effects in the parent attached? Or are there?
in “The Physics of Magic Windows (2021)” · View on HN