Old 08-30-2014, 04:39 PM #1
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Talking Need help with diffuse laser

I'm new. I successfully built a 405nm 150mw laser and driver and it's in an aixiz module. My question is why does the laser spread out past about 1 inch? How do I make it into a beam? Do I have the wrong kind of laser diode? I want my beam to go for miles not an inch lol.


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Old 08-30-2014, 06:38 PM #2
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Default Re: Need help with diffuse laser

Do you have a lens? If not get one. If you do then you need to focus it. Screw it in or out of the module until the laser forms a beam. Be careful when adjusting the focus as you can also focus it to a tiny point which can set things on fire.
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Old 08-30-2014, 06:49 PM #3
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Default Re: Need help with diffuse laser

I have tried all the way in and out and on 2 different housings and 2 different diodes. After about at about a foot away it is as big around as a dinner plate lol.

Here is a video if it burning some electrical tape. If I had it any further away the dot would get big quick.

Also when I found these housings on ebay I just searched for "laser diode housing" not "aixiz housing."

405nm 150mw Burning Laser Diode - YouTube

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Old 08-31-2014, 01:24 AM #4
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Default Re: Need help with diffuse laser

In that case the lens may not be getting close enough to the diode to focus.

What lens do you have?

Also, is there a possibility it is in backwards?
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