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Problem with my collimating lens

fabio00

New member
Joined
Jun 29, 2024
Messages
2
Points
1
Hi everyone,
i repaired a green laser from a laser projector but i have some problems with the collimating lens i changed. I have a very big spot and to focus the laser beam I have to move the lens to a large distance,not compatible with the lens as you can see in photo.What's wrong with the collimating lens i choosed?How can i choose the right lens?Thanks for your help
 

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    focus distance.jpg
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  • laser beam.jpg
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  • laser with lens.jpg
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  • laser without lens.jpg
    laser without lens.jpg
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Joined
Jul 10, 2015
Messages
10,214
Points
113
Your new lens is likely a different Focal Length than your old lens, try to find a better match.
 

Ricker

0
Joined
Oct 14, 2015
Messages
668
Points
63
I would try a G8. Can't promise it will work but a good place to start.
 
Joined
Sep 20, 2013
Messages
18,020
Points
113
Optics are not that difficult. The focal length of your lens will need to be that distance from the emitter face of your diode. You are actually making a beam by focusing the emitter as you would a camera image on your digital CCD or CMOS sensor. Get it?
 

Unown (WILD)

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Sep 4, 2020
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This may be a returning banned member
 




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