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Old 08-22-2009, 01:31 AM #1
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Default Looking for a beam expander

I just bought a 150 mW green laser from Optotronics and want to buy a 10x or 20x beam expander. Maybe someone has one they want to sell, or maybe someone can tell me a cheaper place to buy one. I am a newbie at this, so I don't know if they are generic, or if you can get an adapter, etc. Any help is appreciated!

Rick


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Old 08-22-2009, 02:18 AM #2
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Default Re: Looking for a beam expander

They sell them at optronics there are 3x, 10x and 20x beam expanders with adaptors... btw what do you need it for (what are they used for?)

link is here

20x http://optotronics.com/proddetail.php?prod=mg20x
10x http://optotronics.com/proddetail.php?prod=mg10x
3x Optotronics Product Details
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Lasers!
10.6um - >40W CO2 Laser - 25W RF excited CO2 Laser*
685nm - Being built!
660nm - 250mW LOC PowerLight B50 Host - 100mW WL pulsar
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632.8nm - Red He-Ne laser ~1mW
593.5nm - Regal 5
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532nm - 620mW+ lasersman Firedragon III* - 100mW PGL-III-M from JETLASERS* - 70mW Rayfoss Host*
~~~ - 175mW Rayfoss Host - <5mW WL Core - 55mW DinoDirect review laser*

488nm - On the hoist
473nm - 2x CNI lab lasers ~40mW
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Total: 71,868.5 mW

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Jetlasers wrap around 190-540nm OD4+ goggles*
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Old 08-22-2009, 03:22 AM #3
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Default Re: Looking for a beam expander

Quote:
Originally Posted by rick2580 View Post
I just bought a 150 mW green laser from Optotronics and want to buy a 10x or 20x beam expander. Maybe someone has one they want to sell, or maybe someone can tell me a cheaper place to buy one. I am a newbie at this, so I don't know if they are generic, or if you can get an adapter, etc. Any help is appreciated!

Rick
I have an almost brand new Dragon beam expander with a Viper series laser pointer adaptor. Both the len cap and adaptor screw on and off. The body is made of two halves that screwed on together. You focus it by turning the two halves one way or another. I think the threading is in need of some lubricant because it squeaks when I turn them. If you want I can send you some photos of the expander. Dragon sell it for $89 without the adaptor. The link for Dragon's Beam expander is here.. You can have mine for $60 plus shipping. PM me if you're interested.

Last edited by Maxi3D; 08-22-2009 at 03:25 AM.
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Old 08-22-2009, 03:32 AM #4
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Default Re: Looking for a beam expander

Maxi3D,
Your beam expander is designed for CNI lasers. rick2580's laser is an Optotronics. The beam expander will not fit the Optotronics laser without some custom machining or set screws.
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Old 08-22-2009, 03:36 AM #5
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Default Re: Looking for a beam expander

OK, I see. My bad. Thanks.
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Old 08-22-2009, 03:46 AM #6
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Default Re: Looking for a beam expander

Thanks Maxi and Jimmy. I appreciate it.
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Old 08-22-2009, 03:58 AM #7
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Default Re: Looking for a beam expander

I just found out about this, Bobhaha but it strengthens and focuses the beam. I saw a video on Youtube where the dot from 1000 ft shrunk to 1/10 the size.
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Old 08-22-2009, 04:07 AM #8
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Default Re: Looking for a beam expander

Quote:
Originally Posted by rick2580 View Post
I just found out about this, Bobhaha but it strengthens and focuses the beam. I saw a video on Youtube where the dot from 1000 ft shrunk to 1/10 the size.
It does not strengthen the beam. What the beam expander does is increase the width of the beam by the expansion ratio of the beam expander. For example, if you have a 1mm beam going into a 5X beam expander, the beam will increase in size to 5mm. This effectively makes focusing the laser easier, and it lets you make a focus point which is not possible with a non-focusable laser.
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632.8nm: 10mW Hughes HeNe - 15mW Melles Griot HeNe - 1mW Melles Griot bare tube
612nm: 5mW Meredith Instruments HeNe
594.1nm: 4mW Meredith Instruments HeNe
543nm: 2mW Melles Griot HeNe - <1mW Multimode 6" HeNe (He's cute!)
532nm: 5mW Lyra-G5 - 70mW DIY by Wannaburn
473nm: 5mW Lab Style
445nm: DIY 650mA in Sonar II Host
405nm: DIY LG 10X at 330mA with Ehgemus host and Microboost - CNI GLP-405 70mW
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Old 08-22-2009, 04:42 AM #9
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Default Re: Looking for a beam expander

oh ok i see.. thats pretty smart!
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Lasers!
10.6um - >40W CO2 Laser - 25W RF excited CO2 Laser*
685nm - Being built!
660nm - 250mW LOC PowerLight B50 Host - 100mW WL pulsar
635nm - 430mW C6 Host*
632.8nm - Red He-Ne laser ~1mW
593.5nm - Regal 5
542.8nm - Green He-Ne laser ~2.5mW
532nm - 620mW+ lasersman Firedragon III* - 100mW PGL-III-M from JETLASERS* - 70mW Rayfoss Host*
~~~ - 175mW Rayfoss Host - <5mW WL Core - 55mW DinoDirect review laser*

488nm - On the hoist
473nm - 2x CNI lab lasers ~40mW
445nm - 3W Big Boyz Laser - >1.1W Cree C6 Host - 650mW WL Arctic
405nm - 65mW GLP-405 Aquarius host - 160mW 6x Blu-ray MXDL Host
Total: 71,868.5 mW

Goggles!
Laser glow LSG-532-Sport protective eye goggles OD 7+ 190-532nm HIGHLY RECOMMENDED!!
Jetlasers wrap around 190-540nm OD4+ goggles*
Eagle Pair Red OD4+ goggles
Scopeguy20 Blublockers for 405nm lasers!

* indicates a review has been done, on this item.

Check out my How to Build a Selectable Dummy Load Thread!
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Old 08-22-2009, 06:00 AM #10
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Default Re: Looking for a beam expander

A decent expander will cost more than your laser itself. So far the only expander I have seen with a universal type attachment is from dioptika for about 700 called the DBX. I almost bought it myself until I was educated in how expansion actually works, so now I am getting my plans ready to make my own 20x for about 150 (hopefully). You could get a cheap one like the dragon expander and try to get a member here to make an adapter for you.

I still have some things to research before I attempt the build but here is the link if you wanna follow along my progress. http://laserpointerforums.com/f49/di...der-42814.html
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Old 08-23-2009, 09:58 AM #11
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Default Re: Looking for a beam expander

Aha! Thanks Jimmy. I did not know that. I was lied to! You learn something every day, and every night if you're lucky.
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