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Old 08-14-2009, 09:43 AM #1
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Lightbulb beam expande vs a single focus lens

I have asked this before and really never got an informative answer on how it would or would not work...CAN A BEAM EXPANDER BE USED IN REVERSE TO SHRINK AND TIGHTEN A GROUP OF MULTIPLE BEAMS TO A COMMON FOCAL POINT THAT IS ADJUSTABLE OR CAN THESE BEAMS JUST PASS THROUGH A SINGLE LARGE LENS ONCE, GET A FOACAL POINT AT CLOSE RANGE AND THATS IS? My goal is not to try and get just one beam but extremly compressed beams very close together that is adjustable in it's focal point.


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Old 08-14-2009, 10:39 AM #2
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Default Re: beam expande vs a single focus lens

Can it be that you've asked that several times before? It would be possible, however the problem is that you'd get a pretty bad beam divergence (because you'd be reducing not just the beam separation, but the beam diameter as well. Low diameter=high divergence).

On second reading, I'm not sure what exactly you want to accomplish...?
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Old 08-14-2009, 04:14 PM #3
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Default Re: beam expande vs a single focus lens

anything in life is possible if you know what your doing.

but as above the results might not be very good.

you also cant change the laws of physics, otherwise we would all be doing it!
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Old 08-14-2009, 04:36 PM #4
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Default Re: beam expande vs a single focus lens

Quote:
Originally Posted by zxn474l View Post
I have asked this before and really never got an informative answer on how it would or would not work...CAN A BEAM EXPANDER BE USED IN REVERSE TO SHRINK AND TIGHTEN A GROUP OF MULTIPLE BEAMS TO A COMMON FOCAL POINT THAT IS ADJUSTABLE OR CAN THESE BEAMS JUST PASS THROUGH A SINGLE LARGE LENS ONCE, GET A FOACAL POINT AT CLOSE RANGE AND THATS IS? My goal is not to try and get just one beam but extremly compressed beams very close together that is adjustable in it's focal point.
A magnifying glass will take multiple equally spaced beams and focus them to a point. Since you hold it in your hand it is also adjustable.. For a fixed installation, just a convex lens will work.

If the beams are all different colors, then due to physics principles regarding light refraction each color will be focused at a slightly different point.
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