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Old 07-13-2015, 01:31 PM #1
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Default Femtosecond laser holograms

Hey people,

Came across this video:

https://www.youtube.com/watch?v=AoWi10YVmfE



It's basically the idea we've all been around at, earlier - using the breaking of air with high intensity focused laser to create a hologram mid-air. We all kinda dropped it at the idea that sticking your hand in it will create an awesome hospitalization bill and a story to tell.

They apparently fixed that problem.

Thoughts?


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Old 07-13-2015, 08:29 PM #2
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Default Re: Femtosecond laser holograms

Amazing, Thank you for sharing this.
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Old 07-13-2015, 08:33 PM #3
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Default Re: Femtosecond laser holograms

Very cool stuff, although it seems this technology is very, very expensive. A femtosecond laser that also ionize air.. I wonder what system they use. Maybe modelocked quadrupled Nd:YAG? Or excimer lasers? Who knows..
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Old 07-13-2015, 08:40 PM #4
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Default Re: Femtosecond laser holograms

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Originally Posted by doubleone44 View Post
Very cool stuff, although it seems this technology is very, very expensive. A femtosecond laser that also ionize air.. I wonder what system they use. Maybe modelocked quadrupled Nd:YAG? Or excimer lasers? Who knows..
I doubt it could be a pumped YAG or other neodymium - no pumping source works that fast.

Even common diode semiconductors take what, a dozen nanoseconds to switch states? So how can they claim femto-second level switching?

Another thing, femtosecond level speeds are somewhat irrelevant if it's all going through a galvo set anyway, they are FAR slower than that.

Also, regardless of switching speeds, you still need to focus enough energy to break down air. That is a lot of energy, no way around that - so this approach to display technology will ALWAYS inheretly be very dangerous.

Even in the demo video, whoever is the owner of that finger appears to be quite afraid to stick it into the projection for too long, as if he's poking an open candle's flame.
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Old 07-13-2015, 09:56 PM #5
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Default Re: Femtosecond laser holograms

So we could use this technology to make a hologram of a shark... with a laser attached to it's forehead.
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Old 07-27-2015, 05:42 PM #6
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Default Re: Femtosecond laser holograms

^ hey! I'm still waiting on power-laces, get in line
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Old 07-28-2015, 07:22 PM #7
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Default Re: Femtosecond laser holograms

very cool. I'd love to see this put into some forum of tactical training once it becomes more advanced. Like a video game lol
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Old 07-29-2015, 02:54 PM #8
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Default Re: Femtosecond laser holograms

Quote:
Originally Posted by Eudaimonium View Post
I doubt it could be a pumped YAG or other neodymium - no pumping source works that fast.
Nd:glass can make picosecond pulses and those with some technique can be converted to femtoseconds.

Though Ti and Yb are more common dopants for femtosecond lasers.
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Old 07-29-2015, 03:16 PM #9
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Default Re: Femtosecond laser holograms

Found details at http://arxiv.org/ftp/arxiv/papers/1506/1506.06668.pdf
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