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Old 07-28-2013, 01:31 AM #1
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Default What happens if a lens isn't centered perfectly?

If a lens is off center by less than a millimeter, what happens to the resulting beam? Does it go off to one side or what? I am trying to figure out how perfect the alignment must be.

Also, does anyone know if all C-Mount diodes are the same dimensions? I need to use calipers to measure mine so I can get the diode centered but I am afraid to use them lest I break the die on accident.

Thanks,
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Old 07-28-2013, 01:39 AM #2
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Default Re: What happens if a lens isn't centered perfectly?

The beam shoots out of the laser in an angle and it will rotate while the lens is turning.

All C-mount packages are the same. They are industrial standard. No need to measure it yourself. Find the specs on the net.

***edit** just looked up for myself:
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Old 07-28-2013, 02:13 AM #3
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Default Re: What happens if a lens isn't centered perfectly?

Thank you thank you thank you!!!! This clears things up immensely!
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Old 07-28-2013, 02:28 AM #4
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Default Re: What happens if a lens isn't centered perfectly?

So there should be a hole of radius 2.3mm located exactly 4.1mm below the center of the heatsink (or wherever the lens is to be placed), yes?
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Old 07-28-2013, 05:18 AM #5
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Default Re: What happens if a lens isn't centered perfectly?

Probably use a hole threaded for a 2mm screw. But yes 4.1mm below center looks right to me.
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Old 07-28-2013, 05:53 AM #6
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Default Re: What happens if a lens isn't centered perfectly?

I just got done making all my diagrams for my machinist! I think I am going to hold my lens in with rubber O-rings so as not to scratch it against the metal.

All in all the head of my RPL stylized custom laser should be ~100mm, with the barrel measuring in at ~90mm, assuming a tailcap length of ~15mm.
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Old 07-28-2013, 01:44 PM #7
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Default Re: What happens if a lens isn't centered perfectly?

Quote:
Originally Posted by Blord View Post
The beam shoots out of the laser in an angle and it will rotate while the lens is turning.

All C-mount packages are the same. They are industrial standard. No need to measure it yourself. Find the specs on the net.

***edit** just looked up for myself:
Agree totally with answer except to add that you probably will not get the laser to focus to a spot i have a red 200 mW that does exactly as blord said except that i cant get it to really focus anywhere to a spot it rotates around and gets close but then goes wide again so pretty useless ...
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