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Old 09-17-2008, 03:23 PM #1
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Default RGB beam splitter

Some people yesterday were asking about RGB beam splitters, so I thought today I would try and get mines out of its holder.

Got a few pictures of it removed from the holder, and if anyone doesn't believe that it splits RGB I'll get pictures to prove that as soon as my phones done charging ( Need to use the phones flash as a light source )

here are a couple Of pictures for now .

Oh and one last thing, these can be found in digital projectors, mines was from an old huge old Philps.

Image 1

Image 2

I'm not going to post the full pictures as they are too big, and I can't be bothered to resize them

-Adam


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Old 09-17-2008, 03:32 PM #2
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Default Re: RGB beam splitter

i remember hurcussciences (sp?) selling one of these RGB cubes, I really wanted it but the price went a good bit above $100
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Old 09-17-2008, 03:35 PM #3
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Default Re: RGB beam splitter

That much :-? I is going to make me some cash 8-)

You can actually put this at different angles from the light source and it causes the colors to combine so you get some really pretty colors

-Adam
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Old 09-21-2008, 02:29 PM #4
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Default Re: RGB beam splitter

Any chance you can get these out of cheap old electronics (like a projector, as you said)? Never thought they would be so expensive :O
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Old 09-21-2008, 02:53 PM #5
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Default Re: RGB beam splitter

you can get them from digital projectors, it should be behind the lens ASSY where the image is projected from, if I were you I'd try a newer projector, the one I used was a huge old Philips, nightmare to take apart. It will also have 3 diffraction gratings bolted onto it. and several dichroic mirrors/filters. and A LOT of lenses.

-Adam
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Old 09-25-2008, 01:28 PM #6
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Default Re: RGB beam splitter

yes, those are really great!
they are huge, cubic 3cm! all surfaces AR coated as well. i have one lose one from ebay, and played around with an old beamer/projector as well.
inside any 3xlcd projector you will find such a cube (perhaps a lil smaller, though), and as diachi said, much more. regular dichroic mirrors to combine all colors and mirrors and lenses. any lcd-projector with 800x600 resolution or better has three lcds, older/worse ones perhaps too. theres a page with all (!) beamers data, they write if its LCD and if its a single-lcd or three.
if its not lcd at all, it has a rotating color-wheel. these are dichroic too, and quite good as dichroic beam-combiners too.

now to the cube:
i shined my lasers through it some days ago, after having it around for long time already. red and blu-ray(!) go through without visible loss at all! green loses less than one percent which goes through the cube, instead of being reflected.
if someone needs to know i can measure the laserpower before and after the cube.

bonus: its not polarising at all. you can combine two lasers (like two red diodes for the red laser and so on) with a polarising cube and combine the now unpolarised beams with the cube!
means you can get three tiny polarising cubes out of drives (5mm cube in the ps3 kes-300a sled for example), combine two reds, two bluray, two greens, and combine everything with a dichroic-tricolor-cube. without much loss, and really inexpensive! calculate the costs for this, unbeatable! and, amazingly for an inexpensive 1 watts + (!) beam of &quot;white&quot;, its all in a tight beam the diameter of a regular single-diode-pointer-beam, all 6 input-&quot;beams&quot; are on one dot!
(the other way is to use mirrors to place beams very close to each other. which makes the beam fat and ugly ^^)

so.. get a broken beamer from ebay or somewhere else. no matter how old or broken, you will find great stuff inside!
(except really old tube-beamer, which are as heavy as you are, and have three colored openings at their front)

manuel
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Old 09-28-2008, 11:27 AM #7
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Default Re: RGB beam splitter

Quote:
Originally Posted by Krutz

now to the cube:
i shined my lasers through it some days ago, after having it around for long time already. red and blu-ray(!) go through without visible loss at all! green loses less than one percent which goes through the cube, instead of being reflected.
if someone needs to know i can measure the laserpower before and after the cube.


manuel

Thats how I hoped it would work, I knew the green goes right through, must be a standard configuration , wasnt sure how it would act with other colours , not having other colours to test it with. I think i'll keep mines then and it can eventually go into a scanner :P

-Adam
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Old 12-06-2008, 10:06 PM #8
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Default Re: RGB beam splitter

wow that's cool
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Old 12-24-2008, 12:13 AM #9
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Default Re: RGB beam splitter

i install projector's all the time at work i see like 3or 4 a year die. i just took one apart and guess what i found ? RGB cube as i get more i'll toss them up for trade . this one had 2 very small chips on the top edge (it fell from the ceiling ) ive bin messing with it look's cool . trade's anyone ?
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Old 12-24-2008, 03:11 AM #10
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Default Re: RGB beam splitter

The obvious disadvantage is they are very difficult to align.
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Old 12-24-2008, 11:11 AM #11
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Default Re: RGB beam splitter

Quote:
Originally Posted by Cyparagon
The obvious disadvantage is they are very difficult to align.

I agree with that, before I traded my cube out to Dave I had a go aligning with a red and green and it was pretty tough to get a good alignment. It's good when you do get one though, saves so much space rather than using dichros and mirrors.

-Adam
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Old 12-26-2008, 01:42 PM #12
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Default Re: RGB beam splitter

Word of warning, don't go buying any old broken projector as they do not all contain a cube, I took an &quot;infocus&quot; apart and it did not have one, fortunately it was a broken one from work and cost me nothing.

@ DTMF, you could do us a favour and start listing ones you know to have a cube in

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Old 12-26-2008, 02:32 PM #13
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Default Re: RGB beam splitter

will do . i know the boxlight's have them . i'll look for the model #
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Old 12-26-2008, 06:13 PM #14
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Default Re: RGB beam splitter

Philips have them too, I don't know the model number though, it was a big old thing , huge in size.

-Adam
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Old 12-26-2008, 07:07 PM #15
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Default Re: RGB beam splitter

Guys - easy way to check if projectors have cubes or not

Just google the model number, a site like www.projectorcentral.com or www.aboutprojectors.com will come up

they say right at the top of the page &quot;3 LCD projector&quot; if they have a cube.
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Coherent 60W 830nm water cooled diode brick | Shenhui Laser 40W 10600nm water cooled CO2

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Old 01-07-2009, 08:57 PM #16
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Default Re: RGB beam splitter

Nice find MM, thanks.....our oldest projector has a cube....all I have to do now is wait for it to die.... 8-)

Regards rog8811
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