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Computer-generated holography with ordinary display

119 points by ta988 3y ago

deleted 3y ago
[deleted]
keikobadthebad 3y ago
[flagged]
schappim 3y ago
The paper: https://preprints.opticaopen.org/articles/preprint/Computer-generated_holography_with_ordinary_display/24817062/1/files/43654092.pdf https://preprints.opticaopen.org/articles/preprint/Computer-...
westurner 3y ago
CGH: Computer-generated holography: https://en.wikipedia.org/wiki/Computer-generated_holography https://en.wikipedia.org/wiki/Computer-generated_holography
btbuildem 3y ago
> We demonstrate three-dimensional color image reproduction using a two-layered hologram cascade composed of an iPhone and a spatial light modulator. So, not just an ordinary display then? What does this "spatial light modulator" look like?
- toast0 3y ago
  In this application, it would probably look like a transparent liquid crystal display on top of the phone. Usually LCDs are modulating the polarity of light, and you have polarizing filters before and after so that the modulation of polarity results in modulation of intensity; but I've read about other ways to arrange the LCD such that you modulate the phase of the light passing through instead, that's what you need for holography (although I thought you needed a coherent light source) Here's a commercially available SLM based on reflective Liquid Crystal on Silicon (similar to what you might find in an LCD projector), that actually has listed prices: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=10378 https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=10... No endorsement, just an early search result.
- Animats 3y ago
  Probably like this.[1] It's a variant on a liquid crystal display, set up to adjust phase, rather than intensity. Clever. Price around US$13,000 and up. [1] https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=10378 https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=10...
  - hellonull 3y ago
    That is lab equipment, of course it’s going to be horrendously expensively. Look how much a pack of bolts costs.
    - fasa99 3y ago
      alls I know is the nintendo 3DS could do this on the cheap
    - amelius 3y ago
      Yes, but you get lab snacks :)
boboche 3y ago
An actual holographic article, not some autostereoscopic or barrier! Thanks for the find!
- BlueTemplar 3y ago
  For your bookmarks : https://www.youtube.com/watch?v=TsyzTUa-3VE https://www.youtube.com/watch?v=TsyzTUa-3VE
deleted 3y ago
[deleted]

119 points by ta988 3y ago

deleted 3y ago

[deleted]

keikobadthebad 3y ago

[flagged]

schappim 3y ago

The paper: https://preprints.opticaopen.org/articles/preprint/Computer-generated_holography_with_ordinary_display/24817062/1/files/43654092.pdf https://preprints.opticaopen.org/articles/preprint/Computer-...

westurner 3y ago

CGH: Computer-generated holography: https://en.wikipedia.org/wiki/Computer-generated_holography https://en.wikipedia.org/wiki/Computer-generated_holography

btbuildem 3y ago

> We demonstrate three-dimensional color image reproduction using a two-layered hologram cascade composed of an iPhone and a spatial light modulator. So, not just an ordinary display then? What does this "spatial light modulator" look like?

toast0 3y ago
In this application, it would probably look like a transparent liquid crystal display on top of the phone. Usually LCDs are modulating the polarity of light, and you have polarizing filters before and after so that the modulation of polarity results in modulation of intensity; but I've read about other ways to arrange the LCD such that you modulate the phase of the light passing through instead, that's what you need for holography (although I thought you needed a coherent light source) Here's a commercially available SLM based on reflective Liquid Crystal on Silicon (similar to what you might find in an LCD projector), that actually has listed prices: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=10378 https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=10... No endorsement, just an early search result.
Animats 3y ago
Probably like this.[1] It's a variant on a liquid crystal display, set up to adjust phase, rather than intensity. Clever. Price around US$13,000 and up. [1] https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=10378 https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=10...
- hellonull 3y ago
  That is lab equipment, of course it’s going to be horrendously expensively. Look how much a pack of bolts costs.
  - fasa99 3y ago
    alls I know is the nintendo 3DS could do this on the cheap
  - amelius 3y ago
    Yes, but you get lab snacks :)

boboche 3y ago

An actual holographic article, not some autostereoscopic or barrier! Thanks for the find!

BlueTemplar 3y ago
For your bookmarks : https://www.youtube.com/watch?v=TsyzTUa-3VE https://www.youtube.com/watch?v=TsyzTUa-3VE

deleted 3y ago

[deleted]