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Old 11-12-2009, 05:59 PM #33
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Default Re: RGB beam combining with prism?

with a prism it cannot be coated so there will be a big loss.

with dichros they are coated for each lasers so little losses


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Old 11-14-2009, 03:40 PM #34
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Default Re: RGB beam combining with prism?

You're wrong there. Not saying its a good idea to use a prism by any means, but they can in fact be coated

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Old 11-14-2009, 06:12 PM #35
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Default Re: RGB beam combining with prism?

Keep in mind prisms require pretty big distances to separate colors. I'm talking on the order of 10 feet or more to separate colors by only a cm or two
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Old 11-14-2009, 11:31 PM #36
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Default Re: RGB beam combining with prism?

I suppose thats the main reason dichros are preferable for practical use.

Theoretically a prism separating light into its colors is a perfectly reversible optical system, so that prism can be used to combine colors as well.

Gratings are not likely to work, as they will split the beam up into many smaller beams. It would be possible to get a combined beam out of one, but most power will be lost in the stray beams.

The 17% power loss figure seems reasonable - i assume that prism is uncoated, and it will lose a couple of percent on both the light entering and exeting. With the distance from the lasers added it, it seems acceptable... apart from the size of the setup
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Old 11-15-2009, 05:00 AM #37
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Default Re: RGB beam combining with prism?

Those distances seem to make the whole system a little impractical.
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Old 11-15-2009, 01:58 PM #38
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Default Re: RGB beam combining with prism?

Quote:
Originally Posted by Cyparagon View Post
You're wrong there. Not saying its a good idea to use a prism by any means, but they can in fact be coated

NEW LOT OF TEN EXCELLENT 12MM X11MM COATED WEDGE PRISMS
the most pointless auction ever!! coated for what wavelength??

with dichros so cheap i dont understand why you would want to use something different?
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Old 11-15-2009, 04:04 PM #39
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Default Re: RGB beam combining with prism?

Quote:
Originally Posted by MarioMaster View Post
Keep in mind prisms require pretty big distances to separate colors. I'm talking on the order of 10 feet or more to separate colors by only a cm or two
I've already said and proven that.

Quote:
Originally Posted by Benm View Post
Theoretically a prism separating light into its colors is a perfectly reversible optical system, so that prism can be used to combine colors as well.
What do you mean theoretically? I've DONE it

Quote:
Originally Posted by andy_con View Post
the most pointless auction ever!! coated for what wavelength??
Ever heard of a broadband coating?

Quote:
Originally Posted by andy_con View Post
with dichros so cheap i dont understand why you would want to use something different?
Firstly, I doubt you can find me a set of dicros for under a dollar. Secondly no one really wants to use something different to begin with, except to prove it can be done.

C'mon guys, read the thread before you post.
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Old 11-15-2009, 04:12 PM #40
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Default Re: RGB beam combining with prism?

I second Cyparagon's post.
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Old 11-15-2009, 04:24 PM #41
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Default Re: RGB beam combining with prism?

This has been a great read, informative, Thanks.....
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Old 11-15-2009, 04:31 PM #42
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Default Re: RGB beam combining with prism?

Sorry, I can't always read everything
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