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Old 07-25-2007, 11:28 AM #1
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Default Wanted: Cubed beam splitter

anyone got some cubed beam splitters for 650nm they want to sell.

5-6mm smallest and 10mm biggests.

thanks


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Old 07-25-2007, 05:58 PM #2
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Default Re: Wanted: Cubed beam splitter

What do you want to use it for?
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Old 07-25-2007, 06:12 PM #3
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Default Re: Wanted: Cubed beam splitter

Raid a dvd/cd drive. there's usually one in there that'll work with red.
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Old 07-25-2007, 06:57 PM #4
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Default Re: Wanted: Cubed beam splitter

Yeah I pulled three out of a DVD burner. Very fun to play around with.
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Old 07-25-2007, 09:28 PM #5
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Default Re: Wanted: Cubed beam splitter

Quote:
Originally Posted by pseudonomen137
What do you want to use it for?
erm...

combining two reds?
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Old 07-27-2007, 02:18 AM #6
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Default Re: Wanted: Cubed beam splitter

Quote:
Originally Posted by andy_con
[quote author=pseudonomen137 link=1185362909/0#1 date=1185386304]What do you want to use it for?
erm...

combining two reds?[/quote]

Had a feeling. If you want to combine, it has to be a polarizing beamsplitter. Take it from someone who found out the hard way! *:

surplusshed.com has a few but none meet your specs. Perhaps check around eBay, otherwise you'll be paying an arm and a leg to get these new from a real optics joint.
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Old 07-27-2007, 07:26 AM #7
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Default Re: Wanted: Cubed beam splitter

Yeah i have noticed they are about 100 each. theres lots on ebay but not polorized ones

Quote:
Originally Posted by pseudonomen137
[quote author=andy_con link=1185362909/0#4 date=1185398927][quote author=pseudonomen137 link=1185362909/0#1 date=1185386304]What do you want to use it for?
erm...

combining two reds?[/quote]

Had a feeling. If you want to combine, it has to be a polarizing beamsplitter. Take it from someone who found out the hard way! *:

surplusshed.com has a few but none meet your specs. Perhaps check around eBay, otherwise you'll be paying an arm and a leg to get these new from a real optics joint.[/quote]
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Old 07-28-2007, 09:01 PM #8
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Default Re: Wanted: Cubed beam splitter

I took the rangefinder unit out of a Zorki camera (1$ from ebay...+postage) to combine my red and green to get yellow....it has the advantage of having, after a simple mod, a micro adjustment to bring the beams together.

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Old 07-29-2007, 10:15 AM #9
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Default Re: Wanted: Cubed beam splitter

Could you post pictures of that please?

Thank you;
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Old 07-29-2007, 10:51 AM #10
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Default Re: Wanted: Cubed beam splitter

@ Daedal, I would if I could, it seems I cannot post pictures......... Too new to the forum maybe?

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Old 07-29-2007, 01:58 PM #11
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Default Re: Wanted: Cubed beam splitter

Yeah you have to wait till you have 20 post to post pictures and links, it's a spam prevention thing that has prevented all spam.
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Old 07-29-2007, 03:25 PM #12
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Default Re: Wanted: Cubed beam splitter

@ styropyro, only 11 to go then

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Old 07-29-2007, 03:39 PM #13
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Default Re: Wanted: Cubed beam splitter

i dont want to combine red and green, i want to combine two reds
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Old 07-29-2007, 04:11 PM #14
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Default Re: Wanted: Cubed beam splitter

@ andy_com I cannot think that it would make a difference doing red/red....but that may be a bit simplistic, for all I know the cube may not be that efficient with any colour but it works for what I am doing. The best part about it is is the ease of lining up the beams....and it was cheap!

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Old 07-29-2007, 04:32 PM #15
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Default Re: Wanted: Cubed beam splitter

Hi Rog, I think Andy wants a polarised splitter / combiner to effectively combine 2 beams of the same wavelength with minimal losses. A dichroic filter will combine 2 different wavelengths effeciently by reflecting one colour while allowing transmission of another if the lasers are directed at it at a 90 degree angle , with the dichro positioned at a 45degree angle to both.

Here is a schematic to explain what I mean

Jase.
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Old 07-29-2007, 05:05 PM #16
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Default Re: Wanted: Cubed beam splitter

Hi Jase, I can see why you say it is a nightmare to set up a dichro, lots of odd angles there.
All I can say is that I mentioned the range finder assembly as it is cube made from 2 prisms, back to back but it has the advantage of another prism mounted off to the side on an adjustable pivot, at the price they can be harvested for they must be worth a try for some applications.

Having said all that I am new to this and there are probably losses that to me are unimportant but to people doing more technical things are disasterous.

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