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Old 12-10-2016, 02:33 AM #1
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Default How to focus

EDIT: Oops, I left the placeholder title in when I posted.

About a year ago I got a nice 532nm 100mW handheld from O-like. I was really happy with my purchase, the beam is nicely visible, and it can even light matches from up close. Lately, however, the beam has diverged from its original sharp point and doesn't seem to focus properly. The laser is focusable, but it uses a screw-on end cap that gets uncomfortably loose when I change the focus.





(Sorry for the blurry smartphone pics, it's all I've got)
You can see the end cap here, it unscrews and can be pulled off. Inside the cap there is a threaded lens module, which I assume can be threaded in/out to fine-tune the laser's focus.





The lens module appears to be hot glued (or something) on the threads to prevent it from turning. I want to fix the beam on my laser, so I figured I could just remove the glue, thread the lens in and out until I got a decent focus, then re-glue the lens module to hold it in place.

Is this a bad idea? Is there a chance I'll mess up my laser or the lens if I fiddle with it like this?


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Last edited by link2thepast; 12-10-2016 at 02:42 AM.
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Old 12-10-2016, 02:44 AM #2
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Default Re: How to focus

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Originally Posted by link2thepast View Post

Is this a bad idea? Is there a chance I'll mess up my laser or the lens if I fiddle with it like this?
What does the dot look like just now?

That may be the only way to do it.
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Old 12-10-2016, 03:22 AM #3
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Default Re: How to focus

The dot is about 0.25" in diameter from a couple of feet away, and about 1.5" in diameter from around 10 feet away. The dot used to maintain a nice point, but now it diverges quite a bit with distance.
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Old 12-12-2016, 05:00 PM #4
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Default Re: How to focus

Possible dirty lens? If the lens is glued into the focus lens then maybe the module slipped into the host a bit.
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Old 12-12-2016, 05:01 PM #5
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Default Re: How to focus

Quote:
Originally Posted by 10fenny View Post
Possible dirty lens? If the lens is glued into the focus lens then maybe the module slipped into the host a bit.

A picture of the dot would help us identify the problem with some certainty.
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445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
488nm | Spectra Physics 163 Argon | ~30mW Metered
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520nm | Laserlands 520 | 5mW | For Review Awaiting arrival
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD.850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2
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Old 12-18-2016, 09:01 PM #6
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Default Re: How to focus

Alright, I decided to just try removing the glue and adjust the lens. The lens module was indeed hot-glued into place, so I just used a pair of pliers to free it. When I removed the glue, the module immediately fell free--this makes me think the module had been working itself loose for some time, slowly changing the focus and diverging the beam. I threaded it back into place and everything is fine: the dot is small again and the beam is tightly focused.

Thanks for your input, I'm very happy my laser is fixed.
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