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Old 05-14-2009, 06:51 PM #1
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Default How do I focus my laser?

Hye, how's everybody? I have been inactive for a while because of school. Anyway, I opened this thread, as I do not have any idea on how to focus my 50 mw ledshoppe green laser so it can be more powerful. I know I can do this with a lense but I don't know what kind to use
Any help will be much appreciated. Thanks.


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Old 05-14-2009, 09:20 PM #2
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You might consider using a collimator, which uses a concave lens to spread the beam out, and a convex lens to refocus the beam. I have never used these personally, but they are easy to make and inexpensive. The lenses can be mounted in a PVC tube and adjusted before being secured in place
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Old 05-14-2009, 09:38 PM #3
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To be honest, if you're just focusing to burn things you can use an ordinary magnifying glass.
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Old 05-14-2009, 11:50 PM #4
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Quote:
Originally Posted by ElektroFreak View Post
To be honest, if you're just focusing to burn things you can use an ordinary magnifying glass.
Yeah, ElektroFreak got it.

BUT using a lens makes the laser LESS powerful, BUT it focuses all the light to a tiny point so that it will burn better. Same idea as with a magnifying glass and the sun.

Regards,

Adam
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Old 05-18-2009, 02:00 PM #5
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as others said. magnifying glass
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Old 06-20-2009, 03:21 AM #6
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were can i get a colmnator for a ledshoppe or romeo pointer?
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Old 06-21-2009, 01:12 AM #7
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Default

Quote:
Originally Posted by Silvershot View Post
Hye, how's everybody? I have been inactive for a while because of school. Anyway, I opened this thread, as I do not have any idea on how to focus my 50 mw ledshoppe green laser so it can be more powerful. I know I can do this with a lense but I don't know what kind to use
Any help will be much appreciated. Thanks.

the ones i purchased had a really fat beam like 2.5 mm you may never get it to really burn good although a magnifying glass is your best bet


hey i used one on my blue RPL yesterday and popped a balloon lol it peaks at 50ish
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Old 07-23-2009, 08:27 AM #8
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Default Re: How do I focus my laser?

what about a beam expander?
wont it spread the beam then put it back at a focal point? are there any for pen style lasers?
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Old 07-23-2009, 08:57 AM #9
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Default Re: How do I focus my laser?

Larry has a new lens I think that focuses it better and doesn't cause your green to lose power but actually increase it
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Old 07-23-2009, 09:00 AM #10
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Default Re: How do I focus my laser?

Quote:
Originally Posted by themandalorian View Post
Larry has a new lens I think that focuses it better and doesn't cause your green to lose power but actually increase it
larry who?
do you have a link? my optotronics pen does not have the tip that comes off so the DL beam expander wont work, any others?
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Old 07-23-2009, 06:06 PM #11
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Default Re: How do I focus my laser?

lenses can only increase power density, not power.
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Old 11-17-2016, 11:40 AM #12
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Default Re: How do I focus my laser?

405nm 445nm Laser Diode Three Layer Collimating Coated Glass Lens M9*0.5 HOT | eBay
Should this be okay if I want to focus laser to engrave to white paper with 500mw 405nm laser?
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Old 11-17-2016, 11:56 AM #13
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Default Re: How do I focus my laser?

Yes, you could use this lens, or a G-2 type single element lens which is available from DTR's store.

BTW - You should probably post this in your other thread (Can 300mW or 500mW burn white paper?), or start a new thread as this thread has been dead for over 7yrs.
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Old 11-17-2016, 12:04 PM #14
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Default Re: How do I focus my laser?

Didnt want to start new thread for one simple question, and it wouldnt fit in the category my thread already is in. Anyways wont do this again.

And thanks. Will look at the G-2 lens type
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