Old 09-27-2010, 03:23 PM #1
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Arrow Bad divergence on a 532nm

Hi guys,

Got a FP 200mW (will measure later but it looks about 80mW) keychain laser, the divergence is terrible, the dot is about an inch across at 15-20ft , i can adjust the focus but thats the smalles i can get the dot, is there anything i can do about it?

TIA


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Old 09-27-2010, 03:32 PM #2
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Default Re: Bad divergence on a 532nm

Quote:
Originally Posted by ped View Post
Hi guys,

Got a FP 200mW (will measure later but it looks about 80mW) keychain laser, the divergence is terrible, the dot is about an inch across at 15-20ft , i can adjust the focus but thats the smalles i can get the dot, is there anything i can do about it?

TIA
With a lot of green's you can. I have a couple cheap 532nm pens from ebay and if you remove the top cap you will see a black plastic tube that houses the lens. On all of the ones I've taken apart there has been a weak adhesive that if you turn it, the adhesive will loosen up. By turn the tube you can adjust the focus. This is how it is done on pens I'm not sure about your laser though.

Here is a picture: Link The module on the bottom left is out of a green pen, and you can see the black tube I'm talking about.

-Hope this helps

Edit: Sorry I went back and re-read your question. I guess I read it too fast initially, so this probably doesn't help.
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Last edited by udanis; 09-27-2010 at 03:35 PM.
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Old 09-27-2010, 04:08 PM #3
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Default Re: Bad divergence on a 532nm

Yeah, thanks for trying, ive managed to focus it but even at its sharpest forcus, distance divergence is terrible.
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Old 09-27-2010, 10:29 PM #4
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Default Re: Bad divergence on a 532nm



Anyone any other ideas on how i can improve divergence?
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550mW C6 9mm lens
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445nm Jarob C6 kit (on 3rd diode) 1.9w 9mm lens
Various 532n nm 15mw pens ~ 600mW monster
515nm 34mW Direct Green Diode - LaserBtB
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Old 09-28-2010, 08:51 PM #5
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Default Re: Bad divergence on a 532nm

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Originally Posted by ped View Post


Anyone any other ideas on how i can improve divergence?
You may need a longer focal length Plano-convex lens.

Do this first.
Get a friend to help so they can measure or tell you when the spot is smallest.

Sight your laser on a flat surface at least 50 feet away from you.

Adjust the spot until it is the smallest it can be. The laser is now optimally collimated.

Now if you are not satisfied the only option is to buy a new lens
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Old 09-29-2010, 10:41 AM #6
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Default Re: Bad divergence on a 532nm

Thanks steve.
The lens nearest the output crystal, i need to move that further away you mean?
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515nm 34mW Direct Green Diode - LaserBtB
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Old 10-01-2010, 12:09 AM #7
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Default Re: Bad divergence on a 532nm

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Originally Posted by ped View Post
Thanks steve.
The lens nearest the output crystal, i need to move that further away you mean?

No. You need to move the plano-concave.
Since you don't know what a plano-convex [PCX] lens looks like look around the web. One side's flat the other curved positively. The other lens is either a biconcave or a plano-concave.
There is a slight chance that in place of the pcx lens a biconvex lens is used. I doubt it. But if there is just swap it for a pcx lens if you need too.

Look up Galilean laser beam expanders. This is what you green laser uses.
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Old 10-05-2010, 03:07 PM #8
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Default Re: Bad divergence on a 532nm

I'd say that's pretty typical. Even my CNI PGL-III-A green laser and a labby I have produce about the same amount of divergence as the cheap-o one you have. I was measuring a dot about 1.5cm wide at 30ft. It is nearly exactly in line with the 1.5mRad divergence rating of the laser (see this divergence calculator).

The smaller the beam at the aperture, the greater the divergence. It's the price we pay for a small beam. Still, the divergence you mentioned probably could be improved. I would not touch the lens near the crystals, unless you want to permanently ruin the laser. There is probably a lens in the front of the laser, which you can adjust to your needs.
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Old 10-05-2010, 04:04 PM #9
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Default Re: Bad divergence on a 532nm

Ok i'll check that out when i'm brave enough thanks guys.
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445nm Blord "Big Boy" 3.36w 9mm lens
445nm Jarob C6 kit (on 3rd diode) 1.9w 9mm lens
Various 532n nm 15mw pens ~ 600mW monster
515nm 34mW Direct Green Diode - LaserBtB
Various 650's - 1mW pens upto 300mW C6's
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