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Laser Diffraction problem

 
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MisterCharlie
4.99mW Green Laser Toy


Joined: 16 May 2007
Posts: 9

PostPosted: 9/27/07, 10:33 PM    Post subject: Laser Diff Reply with quote

Hi,

I currently pickedup a 200mW green motorhead laser (broken tho) from the club I work for. I've never seen it in use, they just had it and it looked like it had been smashed...

So I pluged it in, and the motorhead worked normally, except the laser itself was weird... instead of simply having a laser dot, I also get some diffraction aura around it... I've dismantled the whole thing and its not a XY scanner probrem neither a lens defect, its really the laser itself.

Sorry for crappy pick with my macbook photobooth, but do you have any idea of what might be cuasing this problem? thanks.

Pic is showing my arm pointing the laser itslef on the wall, unscrewed from the motorhead. The halo you see around the bright dot is actually visible, its not a camera exposure effect. (the white circles you see is my discoball...)
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Athoul
Wicked Lasers God


Joined: 13 Sep 2005
Posts: 7488
Location: Canada

PostPosted: 9/28/07, 1:13 AM    Post subject: Reply with quote

It could be fractures in the crystal set, but from the picture it does look like a lens issue (although you said it looked clean).

Try cleaning the lens with a microfiber cloth, also..it could be the OC end of the ND:YVO4 crystal or KTP that has dust or particles on it. It's hard to say, but if it was smashed it's likely contaminents have gotten into the optical train somewhere.

_________________
Cheers,

Sean.

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MisterCharlie
4.99mW Green Laser Toy


Joined: 16 May 2007
Posts: 9

PostPosted: 9/28/07, 8:52 AM    Post subject: Reply with quote

cheers, now I just need to find a way to dissolve the thermal paste... cant access the laser casing!
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shikari_rock
Wicked Lasers Master


Joined: 26 Apr 2007
Posts: 979
Picture(s): 34

Movie(s): 1


PostPosted: 10/01/07, 12:09 PM    Post subject: Reply with quote

The same thing happened to me, I scratched the IR filter, so something should be in there that scratched it. You can't see it from the outside, you must disassemble the laser, but if you remove it, don't use the laser until you get a new IR filter.
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Things
4.99mW Green Laser Toy


Joined: 17 Nov 2007
Posts: 6

PostPosted: 11/17/07, 4:43 AM    Post subject: Reply with quote

ohh a laser moving head light, cool! i don't see anything to abnormal about the dot?
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