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Old 01-27-2010, 02:09 AM #1
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Default Curious: Universal Beam Expander/focuser?

If I wanted a focusable green laser, but I really liked a certain non-focusable one, is there a universal beam expander I can buy? Any members here that sell beam expanders for any laser?

incase anyone was wondering I wanted to get the 200mW waterproof Rayfoss laser. Of course the beam expander won't be waterproof, and it's not like I'd need to focus for burning underwater lol


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Old 01-27-2010, 02:11 AM #2
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Default Re: Curious: Universal Beam Expander/focuser?

What would this "certain laser" be that isn't focusable?
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Old 01-27-2010, 02:15 AM #3
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Default Re: Curious: Universal Beam Expander/focuser?

ah looks like I edited my post as you were typing.

It's the 200mW waterproof Rayfoss laser. And no I don't need to focus it underwater lol.
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Old 01-27-2010, 02:59 AM #4
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Default Re: Curious: Universal Beam Expander/focuser?

You can use a concave (or convex, can't remember) lens to focus a beam down, alot cheaper than an attachment... Optotronics Lenses
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Old 01-27-2010, 03:17 AM #5
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Default Re: Curious: Universal Beam Expander/focuser?

well for a pen style pointer you can make your own!!! very easy... go too Information Unlimited - Science Projects, Electronics Kits, Lasers, Tesla Coils, High Voltage Engineering, Plans, Books, Parts, Kits click laser pointers and handheld lasers then scroll to bottem of page....beam expander kit with lenses...49.00

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Old 01-27-2010, 06:08 AM #6
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Default Re: Curious: Universal Beam Expander/focuser?

hmm... I'll draw a picture of what I have in mind:



I'm not exactly after a beam expander (although that would be nice if it were cheap), I just want an external focusing lens.
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Old 01-27-2010, 01:08 PM #7
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Default Re: Curious: Universal Beam Expander/focuser?

LOL, I expected to see this in the end:

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Old 01-27-2010, 01:28 PM #8
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Default Re: Curious: Universal Beam Expander/focuser?

Here's something for ya mikeeey, that I resurrected from an old thread;


Anyone looking for plans on how to make your own DIY BEAM EXPANDER ?

Laser Pointer Range Extender

Decreases beam spread of visible and infra red lasers by a factor of 7 at far field. Simple to construct, fits most laser pointers with simple shimming. Kit includes lenses and plans. Other parts are easily obtainable from your hardware store. COLMIN1 - Plans ............................Free Download
COLMIN1K - Lens Kit/Plans ........................$49.95

This is located in Information Unlimited - Science Projects, Electronics Kits, Lasers, Tesla Coils, High Voltage Engineering, Plans, Books, Parts, Kits I thought that maybe some adventurous soul would like to take a stab at this............rob
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Old 01-27-2010, 10:40 PM #9
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Default Re: Curious: Universal Beam Expander/focuser?

Quote:
Originally Posted by phoenix77 View Post
Here's something for ya mikeeey, that I resurrected from an old thread;


Anyone looking for plans on how to make your own DIY BEAM EXPANDER ?

Laser Pointer Range Extender

Decreases beam spread of visible and infra red lasers by a factor of 7 at far field. Simple to construct, fits most laser pointers with simple shimming. Kit includes lenses and plans. Other parts are easily obtainable from your hardware store. COLMIN1 - Plans ............................Free Download
COLMIN1K - Lens Kit/Plans ........................$49.95

This is located in Information Unlimited - Science Projects, Electronics Kits, Lasers, Tesla Coils, High Voltage Engineering, Plans, Books, Parts, Kits I thought that maybe some adventurous soul would like to take a stab at this............rob
nice job resurrecting it! but you could have also resurrected it from post #5 by sandidgepatrick here in this thread LOL


I looked at the kit...but... well, to be honest the kit is my last choice.

Aren't there lens's that use 4 screws to stay tightly on, used for other things? such as cameras or telescopes?
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Old 01-27-2010, 11:04 PM #10
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Default Re: Curious: Universal Beam Expander/focuser?

ya know a simple telescope can be a beam expander. Principle is the same.
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Old 01-30-2010, 04:52 PM #11
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Default Re: Curious: Universal Beam Expander/focuser?

Also the oculars for microscopes and stereomicroscopes work as beam expanders or beam concentrators
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Old 01-30-2010, 07:15 PM #12
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Default Re: Curious: Universal Beam Expander/focuser?

or if you have binoculars unscrew one of the objective lens and use that
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Old 01-30-2010, 08:47 PM #13
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Default Re: Curious: Universal Beam Expander/focuser?

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or if you have binoculars unscrew one of the objective lens and use that
this is true but the eyepieces used in microscopy have the advantage that can be easy connected to a c-mount adapter
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Old 02-02-2010, 06:08 AM #14
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Default Re: Curious: Universal Beam Expander/focuser?


^^^ (in regards to not being able to find a mount on focuser)

edit: actually, I spoke with yobresal, and here's what he said about the laser:

Quote:
it was total rubbish. Unless you mean the red one. The red one is good. Green was way underspec and terribly divergent.
so it looks like the 50mW is great, but the 200mW one isn't (unless he just got a bad one?) Still, it's not something I'm going to pay for and hope I get a good one. I'll keep on waiting for o-like's 200mW waterproof and focusable laser that Susie keeps telling me about.
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