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Old 06-19-2011, 03:02 PM #1
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Default hello all ive just registered as i need some help

i just need a little help and i thought you is the place to come.

im woundering if its possiable to get a laser that is adjustable to upto around 40-50mm beam and it needs to shine a minium of 50yds.


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Old 06-19-2011, 03:19 PM #2
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Default Re: hello all ive just registered as i need some help

What you want is a beam expander. What are you willing to spend? Commercial ones aren't cheap... might want to look into building one yourself if you're patient enough.

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Old 06-19-2011, 03:21 PM #3
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Default Re: hello all ive just registered as i need some help

what will i need? ive got soldering gear
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Old 06-19-2011, 03:41 PM #4
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Default Re: hello all ive just registered as i need some help

You'll need to pair a short focal length lens with a much longer focal length lens. The ratio of these focal lengths is the expansion factor.



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Old 06-19-2011, 03:55 PM #5
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Default Re: hello all ive just registered as i need some help

ive got a old air rifle scope, the end lens screws off. could this be used?
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Old 06-19-2011, 03:56 PM #6
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Default Re: hello all ive just registered as i need some help

Well... you could try. Monoculars work too.

I've got the lenses here somewhere to build a 22x expander. Never got round to it.

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Old 06-19-2011, 04:14 PM #7
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Default Re: hello all ive just registered as i need some help

laser wise what should i look be looking at? i dont want to spend alot of (as it might not work) and i really could do with it being green
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Old 06-19-2011, 04:16 PM #8
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Default Re: hello all ive just registered as i need some help

Well... any module should do really. You could probably even make it work with a 5mW module.

If you use a 20x expander, you'd have a 20-30mm beam and ridiculously low divergence. This would give you a pretty easily visible dot at range at night.

What is this for?

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Old 06-19-2011, 04:19 PM #9
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Default Re: hello all ive just registered as i need some help

Don't mean to be rude trevor but he hasn't actually stated the use of such a laser why not get one which is readily adjustable focus.
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Old 06-19-2011, 04:19 PM #10
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Default Re: hello all ive just registered as i need some help

im looking to try and make something along these lines without the major cost of the unit.

ND3 Green Laser Designator for Military, Law Enforcement and EMT | Laser Genetics
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Old 06-19-2011, 04:22 PM #11
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Default Re: hello all ive just registered as i need some help

Quote:
Originally Posted by laserpyro View Post
Don't mean to be rude trevor but he hasn't actually stated the use of such a laser why not get one which is readily adjustable focus.
He needs a tight beam at range. You don't get that with your run-of-the-mill focusable laser. A cheap Chinese focusable laser will not cut it.

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im looking to try and make something along these lines without the major cost of the unit.

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I figured. A module with a beam expander is just what you need. You could probably get away with a 10x expander. That would give you a 15mm beam or so at the aperture, and a 20mm beam by the time you get to ~50m out.

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Old 06-19-2011, 04:24 PM #12
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Default Re: hello all ive just registered as i need some help

so how much would module + beam expander cost together?
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Old 06-19-2011, 04:29 PM #13
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Default Re: hello all ive just registered as i need some help

It depends on the quality of module you want.

If you want to get the expander affordably, you'll need to build it. There's a calculator out there somewhere that will help you pick lenses... let me see if I can find it.

Building an expander will require mounting optics in some sort of tube and mounting them to the module.

-Trevor
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Old 06-19-2011, 04:43 PM #14
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Default Re: hello all ive just registered as i need some help

a 20 module be any good?
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Old 06-19-2011, 04:54 PM #15
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Default Re: hello all ive just registered as i need some help

Probably. Link?

You want something that's going to stay relatively stable, is well-heatsinked, and will stay in TEM00 generally.

The device you linked is purpose-built for firearms and is self-contained and gun mountable. The cost and effort involved in building something similar is going to add up quick. Make sure you consider that before diving in. ><

-Trevor
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Old 06-19-2011, 04:56 PM #16
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Default Re: hello all ive just registered as i need some help

i havent got a link it was a question. ive come on here to see if its possiable and what cost it would be at before i started thinking about doing it hahah.

the idea is for to be gun mounted like that unit, but without the 200 price tag
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