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Old 04-01-2008, 09:14 PM #17
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Default Re: Diffraction Grating?

I believe it starts as a projection hologram and it etched from there. Darn -- They mass produce the stupid little ones and they work with my DL95 --- but not on the clouds.

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Old 04-01-2008, 10:29 PM #18
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Default Re: Diffraction Grating?

lol, maybe some time....in the future...there will be
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Old 04-01-2008, 11:14 PM #19
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Default Re: Diffraction Grating?

Niko -- If you find one -- You da man !!
Remember that the DG's with the little lasers project a 6' immage at 5 to 10 feet. We need an immage which will project at ~ 1000' on the clouds. Maybe a lens will be needed.

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Old 01-20-2009, 07:14 PM #20
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Default Re: Diffraction Grating?

so im still not gettin ANY information on the internet about how this gratings work / or are made.

i now about how the holograms work, but these things are way to cheap to have this technology applied.

those things are in fact custom made gratings. and as it seems production costs are a minimum..

how does this work? there has to be a DIY way
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Old 01-21-2009, 01:32 PM #21
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Default Re: Diffraction Grating?

nobody? im gonna have to dissect such a thing and slap it under the microscope..
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Old 01-21-2009, 04:10 PM #22
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Default Re: Diffraction Grating?

You know, you could also use a CD. Itīs one of the simpliest but also cheapest diffractiong ratings
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Old 01-21-2009, 08:15 PM #23
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Default Re: Diffraction Grating?

Can't tell ya how they're made but I do actually have a batman one *;D

It came with a cheapo red pointer and about 40 other gratings that I paid like $2 for *:P

(sorry it's at home so I can't get a pic of it for you guys)
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Old 01-21-2009, 09:14 PM #24
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Default Re: Diffraction Grating?

as promised i took one apart and viewed it under a microscope.

first: those are really gratings, and not some masking.

this is the original shape:


100x magnification:


300x magnification:


this is an acylic piece (not a lens!) with a semi-transparent print(?) on one side.


so any physics proof people here, that can explain me how the heck this all works?!

is this some kind of printed transmission holoram?
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Old 01-21-2009, 09:28 PM #25
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Default Re: Diffraction Grating?

i did a little research, and those things, are in fact printed transmission holograms.

you can DIY it: http://corticalcafe.com/prog_CGHmaker.htm

sadly i don't have a laser printer.. anyone dare to try this?
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Old 01-21-2009, 09:35 PM #26
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Default Re: Diffraction Grating?

interesting tidbit:

Quote:
Another major advance in display holography occurred in 1968 when Dr. Stephen A. Benton invented white-light transmission holography while researching holographic television at Polaroid Research Laboratories. This type of Hologram can be viewed in ordinary white light creating a "rainbow" image from the seven colors which make up white light. The depth and brilliance of the image and its rainbow spectrum soon attracted artists who adapted this technique to their work and brought holography further into public awareness.
Benton's invention is particularly significant because it made possible mass production of Hologram using an embossing technique. These Hologram are "printed" by stamping the interference pattern onto plastic. The resulting Hologram can be duplicated millions of times for a few cents apiece. Consequently, embossed Hologram are now being used by the publishing, advertising, and banking industries.
http://www.tamperevidenthologram.com/History_of_hologram.html
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Old 02-01-2009, 03:00 AM #27
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Default Re: Diffraction Grating?

Bump, do you mean this:
http://en.wikipedia.org/wiki/Laser_printer

If so I know tons of people that have them.
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Old 02-01-2009, 05:59 AM #28
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Default Re: Diffraction Grating?

I tried it on my laser printer (Advertised as 600DPI) and got nothing. You really need a few orders of magnitude more resolution for this to work.
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Old 02-06-2009, 02:44 PM #29
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Default Re: Diffraction Grating?

Quote:
Originally Posted by 691175002
I tried it on my laser printer (Advertised as 600DPI) and got nothing. You really need a few orders of magnitude more resolution for this to work.
thank you for trying it. i'm working on a different aproach now, see http://www.laserpointerforums.com/fo...num=1230659546
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Old 02-07-2009, 04:46 PM #30
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Default Re: Diffraction Grating?

Quote:
Originally Posted by wummi
as promised i took one apart and viewed it under a microscope.

first: those are really gratings, and not some masking.

this is the original shape:


100x magnification:


300x magnification:


this is an acylic piece (not a lens!) with a semi-transparent print(?) on one side.


so any physics proof people here, that can explain me how the heck this all works?!

is this some kind of printed transmission holoram?
Cool pics, man!

Would love to see some more research into this. I had completely forgotten about the batman diffraction grating :P
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Old 12-24-2010, 12:38 AM #31
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Default Re: Diffraction Grating?

What we really need is Batman, Ironman and X-men
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Old 12-31-2010, 01:24 PM #32
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Default Re: Diffraction Grating?

There is a nice review from DJNY for gratings from Jetlasers:

Awesome diffraction gratings

Looks very good...
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