Old 12-02-2012, 06:47 AM #1
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Default Is there a lens that I can use with a 445nm Laser to make it round?

So, I am new here and on my way with a 1.9W 445nm SH-032. I will have pics up soon and the full specs. Why can't a lens be made to re contour a 445nm beam, to be a circle. Direct the light into a circle. If it is focusable, then It could always be made to be a circle...? Is a G1 or a 3 lens setup better?



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Old 12-02-2012, 10:39 AM #2
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Default Re: Is there a lens that I can use with a 445nm Laser to make it round?

If you want better beam specs, you can use 3-element structured Aixiz Glass Lenses.. G1 has horrible divergence and makes worse dot than the 3-element..

There are corrective optics and anamorphic prism pairs aswell if you want to go that route..
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Old 12-02-2012, 10:52 AM #3
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Default Re: Is there a lens that I can use with a 445nm Laser to make it round?

You will never get a perfectly round beam profile from
a multimode LD. The output beam profile of a multimode
LD looks like this ------


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Old 12-02-2012, 03:41 PM #4
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Default Re: Is there a lens that I can use with a 445nm Laser to make it round?

You can definitely improve on the dot using a different lens. Try Lazeerer heres a thread about his C lens: http://laserpointerforums.com/f65/os...s-77127-2.html

Edit: AnthoT also had a nice lens but Im not sure hes still selling them: http://laserpointerforums.com/f49/fo...ens-76297.html You could try to email him if you wanted one.
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Old 12-02-2012, 05:22 PM #5
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Default Re: Is there a lens that I can use with a 445nm Laser to make it round?

The only way I'm aware to make a multimode diode's dot round is to fiber-launch it. It's more trouble than it's worth though. The rectangle is just something you've gotta learn to live with.



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Old 12-06-2012, 09:53 PM #6
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Default Re: Is there a lens that I can use with a 445nm Laser to make it round?

I see... :/
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Old 12-08-2012, 03:45 PM #7
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Default Re: Is there a lens that I can use with a 445nm Laser to make it round?

Quote:
Originally Posted by HitShane View Post
So, I am new here and on my way with a 1.9W 445nm SH-032. I will have pics up soon and the full specs. Why can't a lens be made to re contour a 445nm beam, to be a circle. Direct the light into a circle. If it is focusable, then It could always be made to be a circle...? Is a G1 or a 3 lens setup better?
It probably doable, but not doable by any singular lens.
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Old 12-08-2012, 10:32 PM #8
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Default Re: Is there a lens that I can use with a 445nm Laser to make it round?

It could be done with single lens .. but it would have to be astigmatic.
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Old 12-09-2012, 01:36 AM #9
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Default Re: Is there a lens that I can use with a 445nm Laser to make it round?

^I don't think so. It might help with divergence, but I'm pretty sure it would still be rectangular or square.
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Old 12-09-2012, 03:21 AM #10
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Default Re: Is there a lens that I can use with a 445nm Laser to make it round?

'Help with divergence' is what we want right ? Question is how much. Can it be completely corrected ? I didn't see it done .. but does that mean it's theoretically impossible ? I don't think so. If the beam has only different divergence in each axis, it should be possible.
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Old 12-09-2012, 03:37 AM #11
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Default Re: Is there a lens that I can use with a 445nm Laser to make it round?

D.A.

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