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Old 11-11-2011, 11:14 PM #49
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Default Re: First test on a DIY 40W CO2 laser

Quote:
Originally Posted by AnselmoFanZero View Post
Try the red laser, but 650 to 10600 is like apples and M3 screws
The focal length will be different, and that's about it.

Quote:
Originally Posted by AnselmoFanZero View Post
First thing I would try, is flippin the lens round...
That will do absolutely nothing


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Old 11-12-2011, 09:11 AM #50
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Default Re: First test on a DIY 40W CO2 laser

A plano convex lens isn't symmetric, flipping it around will change the spot size. The smallest spot size is obtained with the flat end at the focal point side, but it's a small effect so it can't be the problem here.
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Old 11-12-2011, 10:34 AM #51
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Default Re: First test on a DIY 40W CO2 laser

I tried the lens with a red beam and I obtained a focused spot at the distance of approx. 12 cm. Very similar results were obtained with flipped lens. Later I'm going to try again with the CO2 using more accurate distances.

I appreciate all comments
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Old 11-12-2011, 08:01 PM #52
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Default Re: First test on a DIY 40W CO2 laser

Problem solved

honestly I don't know why (maybe for the lens diameter) but the problem was that this lens has a very precise focal length (9.8 cm) just a millimeter more or less and it goes out of focus.

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Old 11-12-2011, 09:02 PM #53
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Default Re: First test on a DIY 40W CO2 laser

May I suggest one of these if you are having issues with your znse?

Used ZnSe 7.5"F.L. Carbon Dioxide Laser Lens Infrared IR Optic CO2 1.5" Diameter | eBay
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Old 11-13-2011, 08:38 AM #54
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Default Re: First test on a DIY 40W CO2 laser

Quote:
Originally Posted by jeffreythe00 View Post
May I suggest one of these if you are having issues with your znse?

Used ZnSe 7.5"F.L. Carbon Dioxide Laser Lens Infrared IR Optic CO2 1.5" Diameter | eBay
Thanks Jeff, my lens is weird but works at the moment... I don't understand but it works at 9.8 cm (focal distance) but, for example, at 10 cm it produces a hole (in a black thin plastic) bigger than holes produced by the "pure" beam
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Old 11-13-2011, 02:06 PM #55
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Default Re: First test on a DIY 40W CO2 laser

That shouldn't be possible. What about at 9.6cm?
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Old 11-13-2011, 02:24 PM #56
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Default Re: First test on a DIY 40W CO2 laser

Quote:
Originally Posted by Cyparagon View Post
That shouldn't be possible. What about at 9.6cm?
I measured with a technically non-aligned system and with few time for testing, so it is certainly possible!!!
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Old 11-13-2011, 03:08 PM #57
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Default Re: First test on a DIY 40W CO2 laser

Just to be sure... is this what you're claiming? That the light suddenly changes direction at the focal point?

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Old 11-13-2011, 03:52 PM #58
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Default Re: First test on a DIY 40W CO2 laser

No, no is more similar to this


But more likely are the tests that were not conducted with much scientific strictness
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Old 11-13-2011, 06:39 PM #59
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Default Re: First test on a DIY 40W CO2 laser

Sorry for double posting, but I want to back IT with a small movie with the laser equipped with the ZeSn lens. Now it's capable to cut a pencil

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Old 11-17-2011, 02:33 PM #60
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Default Re: First test on a DIY 40W CO2 laser

I added a red aiming to the beast... the next step will be represented by a lens beam combiner




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Old 11-22-2011, 01:22 AM #61
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Default Re: First test on a DIY 40W CO2 laser

ciao! vedo che il tuo progetto continua davvero bene!
peccato che non entro piu molto nel forum per seguirlo...!!!
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Old 11-22-2011, 07:46 AM #62
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Default Re: First test on a DIY 40W CO2 laser

Quote:
Originally Posted by realista View Post
ciao! vedo che il tuo progetto continua davvero bene!
peccato che non entro piu molto nel forum per seguirlo...!!!
Grazie, magari uno di questi giorni, se non sei impegnato ci vediamo
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40W, 10600 nm DIY CO2 laser Link
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