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Old 01-07-2008, 01:06 AM #17
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Default Re: A few pieces of glass:

Seems like if it was something inexpensive enough, efficient enough and easy enough for someone on one of our budgets to do, I am sure it would have been done before by someone like arctos for example...

But it certainly seems as though you are ambitious enough to go through with it, so post some pictures and results. I am sure others would love to see it too...


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Old 01-07-2008, 01:09 AM #18
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Default Re: A few pieces of glass:

Optical phase shifting and optical delay media are relatively new. It was only a few years back that they found a way to really "slow" light through certain media. And not like the difference between light in a vacuum vs. light through water... I mean cutting the speed by significant, LARGE percentages. Not sure how it works, but I will be soon!

D

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Old 01-07-2008, 01:15 AM #19
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Default Re: A few pieces of glass:

xanatos i have a bunch of cubic beam splitters from my blu-ray sleads if you want them i will sell them to you for a couple of bucks i also have the tunning mirrors if you are interested pm me
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Old 01-07-2008, 01:23 AM #20
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Default Re: A few pieces of glass:

If I am not mistaken the real advances made in light slowing revolved around plasma or something... don't remember the facts (so dont quote me). But they slowed it down relatively.... it might be a 100th of its original speed, but that is still very fast.... 3 x 10^6

By all means... try it, thats how new inventions are made, but I'm not holding my breath for results... 8-)
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Old 01-07-2008, 01:26 AM #21
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Default Re: A few pieces of glass:

Rubberband- PM'd ya.

Mlip- watch the future happen before your eyes!

D

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Old 01-07-2008, 01:31 AM #22
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Default Re: A few pieces of glass:

haha, I'm looking forward to it!

Quote:
Howell and his colleagues created a four-inch-long chamber filled with cesium gas heated to about 212 degrees Fahrenheit. When they sent pulses of laser light through that gas, the cesium atoms put the brakes on the leading edge of that wave, creating a photonic traffic jam.

"Essentially, the light just piles up," Howell said.

Once the slowed light exits, it naturally resumes it normal velocity -- 300 million meters per second, or fast enough to circle the Earth seven times in one second.

Most important, the peaks and troughs of Howell's light waves remained in phase as they stacked up, meaning they did not get out of step and cancel one another out. That is key, because phase is one aspect of light that carries information.

To prove that their slowed light did not get scrambled, the team sent their beam through a tiny stencil, less than one-fourth inch on each side, with the block letters "UR" -- the university's initials. Like a shadow-puppet image, that "UR"-shaped beam passed through the chamber, slowed and then emerged with its block letter message intact, as detected by a camera at the end.

Unlike most other systems for slowing light, this one worked at very low light levels. In one experiment, the "UR" image was clear even when a single photon -- the smallest possible quantity of light -- was beamed through the stencil.

The cesium-induced delays were brief, on the order of a few billionths of a second each. Looked at differently, each instance amounted to a two-foot long beam of light being compressed to less than four inches.
A bit interesting.... whole article can be found here :
http://www.washingtonpost.com/wp-dyn...011801683.html
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Old 01-07-2008, 01:39 AM #23
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Default Re: A few pieces of glass:

Fascinating stuff isn't it? Thanks for posting that, It'll probably help me find references. I'll try to find the article where they literally STOPPED a light beam in it's tracks, in mid-media, then released it later. That's the stuff I'm looking at. I wish I had made more of a note of it when I first saw it.

D
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Old 01-07-2008, 02:13 AM #24
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Default Re: A few pieces of glass:

Here's a picture of an arctos unit that has been infecting lots of post over at PL... 48 red diodes... it puts out 30Watts of White Light

445nm, 532nm and I think 650nm....
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A few pieces of glass:-technics_thomas_at_work_2.jpg  
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Old 01-07-2008, 02:19 AM #25
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Default Re: A few pieces of glass:

NICE!!!!

Thanks for posting that. Now picture this in a 4" x 4" space! Someday...
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Old 01-07-2008, 02:42 AM #26
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Default Re: A few pieces of glass:

Alright... I'll take your word for it... as long as once it goes into production I get Serial Number 0004 ;D ... what can I say I like the #4...
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Old 01-07-2008, 02:43 AM #27
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Default Re: A few pieces of glass:

That is one amazing photo of the Arctos unit. It just shows what's possible, eh?

As for the question of slowing down light, the researchers that actually stopped light in it's tracks and made it continue on seconds later were using a supercold field of bosons known as a Bose-Einstein condensate. http://en.wikipedia.org/wiki/Bose%E2...ein_condensate It was groundbreaking research involving temperatures a few degrees above absolute zero Kelvin. (And no doubt HUGE budgets. Here's the link to their research:
http://www.nist.gov/public_affairs/r...background.htm

Cheers, CC
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Old 01-07-2008, 03:35 AM #28
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Default Re: A few pieces of glass:

Xanatos... I am sure you've heard about people complaining about the power and water requirements of Ar/Kr lasers... I would hate to have to have a steady supply of liquid helium to keep my lasers kool ;D

Or the TEC that could achieve those temps... that would be a massive heatsink
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Old 01-07-2008, 05:01 AM #29
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Default Re: A few pieces of glass:

Quote:
Originally Posted by mliptack
Here's a picture of an arctos unit that has been infecting lots of post over at PL... 48 red diodes... it puts out 30Watts of White Light

445nm, 532nm and I think 650nm....
I wonder if that guy's keeping his eyes closed or something. I guess goggles really aren't necessary when playing with 30 Watts.
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Old 01-07-2008, 11:22 AM #30
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Default Re: A few pieces of glass:

Well if the beam is bright enough to see in broad daylight...
It's a safe bet, though, that nobody's gonna wave that beam around and accidentally get his eye.
And what frakin goggles are you gonna use with 30W of WHITE??? what, a black piece of steel?
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Old 01-08-2008, 01:18 AM #31
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Default Re: A few pieces of glass:

Quote:
Originally Posted by BlueFusion
Well if the beam is bright enough to see in broad daylight...
It's a safe bet, though, that nobody's gonna wave that beam around and accidentally get his eye.
And what frakin goggles are you gonna use with 30W of WHITE??? what, a black piece of steel?
You could use some kickass expensive IR goggles :P

I have a few questions though.I see the arctos is using a cr*p load of dvd diodes(?) 2 green DPSS modules....what laser is the 445nm blue?
And how did they manage to create a shadow-puppet type "UR" image with one photon??!

Anyway, the light slowing and stoping is pretty cool.Didn't even knew that was possible :P
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Old 01-08-2008, 03:50 AM #32
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Default Re: A few pieces of glass:

Quote:
Originally Posted by Curiously_Coherent
That is one amazing photo of the Arctos unit. It just shows what's possible, eh?

As for the question of slowing down light, the researchers that actually stopped light in it's tracks and made it continue on seconds later were using a supercold field of bosons known as a Bose-Einstein condensate. http://en.wikipedia.org/wiki/Bose%E2...ein_condensate It was groundbreaking research involving temperatures a few degrees above absolute zero Kelvin. (And no doubt HUGE budgets. Here's the link to their research:
http://www.nist.gov/public_affairs/r...background.htm

Cheers, CC

For slowing down light they use something called Electromagnetically Induced Transparency in an ultracold gas, not only can they slow it down but they can even stop the light completely. This research is done below one microkelvin, so it is more like a few 100 millionths of a degree above absolute zero, and you dont cool the lasers down that cold, the lasers are used to cool the gas down to those temperatures.
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