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Old 04-23-2010, 04:45 AM #17
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Default Re: Getting a dot out of a 808nm bar diode....

If snoctony says it's FAC then it's FAC.. He's a great seller.


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Old 04-23-2010, 04:56 AM #18
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Default Re: Getting a dot out of a 808nm bar diode....

EF, a few days I messaged snoctony, and told him that I wanted to try and focus a multimode (line) IR diode. I asked about a FAC lens and he said to try this lens here:
Double Convex Focusing Lens for 808nm IR laser - eBay (item 130379797402 end time May-01-10 07:50:16 PDT)

Do you think it will do the trick?

I'll buy one and try it if you think it might work...
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Last edited by jayrob; 04-23-2010 at 05:09 AM.
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Old 04-23-2010, 04:57 AM #19
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Default Re: Getting a dot out of a 808nm bar diode....

Quote:
Originally Posted by jayrob View Post
A few days I messaged snoctony, and told him that I wanted to try and focus a multimode (line) IR diode. I asked about an FAC lens and he said to try this lens here:
Double Convex Focusing Lens for 808nm IR laser - eBay (item 130379797402 end time May-01-10 07:50:16 PDT)

Do you think it will do the trick?
That's precisely what you need along with a FAC corrected diode.
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Old 04-23-2010, 05:03 AM #20
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Default Re: Getting a dot out of a 808nm bar diode....

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Originally Posted by ElektroFreak View Post
If snoctony says it's FAC then it's FAC.. He's a great seller.
Alright cool, now I just need to rig up a housing and module
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Old 04-23-2010, 05:09 AM #21
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Default Re: Getting a dot out of a 808nm bar diode....

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Originally Posted by ElektroFreak View Post
That's precisely what you need along with a FAC corrected diode.

Ok now I know a little more than before! Thanks!

Now... Can you help in identifying whether or not the diode is corrected with a FAC lens?

I bought these: (no data sheet though)
808nm 1000mw 1W burning IR laser diode. USA 3 day ship - eBay (item 270565425398 end time Apr-28-10 03:14:01 PDT)
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Old 04-23-2010, 05:17 AM #22
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Default Re: Getting a dot out of a 808nm bar diode....

Unfortunately I've never seen a FAC corrected 9mm diode, and it would be nearly impossible to have it in a can if it did.. I would highly doubt those diodes have FAC. Typically they're found on c-mount diodes and larger. Those can still be used, but you'll need to arrange a rod or cylinder lens and that convex lens from snoctony in order to focus the beam.
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Old 04-23-2010, 05:25 AM #23
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Default Re: Getting a dot out of a 808nm bar diode....

Ok... thanks for the information...

I guess I had already gathered that, but just hoped that you knew something different...
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Old 04-23-2010, 05:28 AM #24
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Default Re: Getting a dot out of a 808nm bar diode....

I wish I did.. they're kind of frustrating things, multimode diodes. They're where you get your real power from, though. Could you rig up a c-mount host of some sort? You'd have to play with the lens arrangement beforehand so you can get measurements that give you either a focused spot or a beam depending on what you want.
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Last edited by ElektroFreak; 04-23-2010 at 05:32 AM.
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Old 04-23-2010, 05:33 AM #25
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Default Re: Getting a dot out of a 808nm bar diode....

Yes I could, if it could focus with an AixiZ threaded lens nut...

Do you have a line on C-mount diodes that could be collimated to a dot instead of a line?
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Old 04-23-2010, 05:46 AM #26
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Default Re: Getting a dot out of a 808nm bar diode....

Browse snoctony for FAC corrected c-mounts.. here's a complete package:

2000mw 808nm laser diode C-mount + FAC+ a focusing lens - eBay (item 140396160499 end time May-01-10 07:50:14 PDT)

Multimode diodes will always have much higher divergence and much "dirtier" beams than singlemode diodes. There will be multiple hot spots and the output will still be square. The FAC+convex approach is best used for focusing to a point for burning. Using just a convex lens the laser will not burn very precisely since the output will be a line, spreading the power over a larger area.
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Old 04-23-2010, 05:50 AM #27
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Default Re: Getting a dot out of a 808nm bar diode....

All c-mount diodes are multimode right? What exactly is meant by multimode? It's not like the modes a DPPS or gas laser has is it?

Why does snoctony sell double concave lenses labeled for use with 635nm and double convex lenses for 650nm? Is there a reason or does he just not have the others listed at the moment? I can't think of any reason for a double concave lens other than a beam expander

Thanks for the help on this, I can't find info that I can understand anywhere!

Could I use a double concave lens followed by a double convex lens to even out the hotspots?

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Old 04-23-2010, 05:50 AM #28
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Default Re: Getting a dot out of a 808nm bar diode....

2800mA's current!

That's serious! I'll bet this driver will do well with it:
http://kaidomain.com/ProductDetails.aspx?ProductID=1770

Wonder if that lens is in a nut? Probably not huh...
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* FS: 405-G-1 Glass Lens Mod for Blu-ray! 31% increase in power vs AixiZ acrylic!

* FS: New! 1000 Lumen XML-2 Maglite Modification With Voltage Monitor! - Parts or Complete Light! Must see!

* FS: Polished Stainless Steel Green Kit! Easy assembly in minutes!

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Old 04-23-2010, 05:55 AM #29
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Default Re: Getting a dot out of a 808nm bar diode....

Quote:
Originally Posted by jayrob View Post
Yes I could, if it could focus with an AixiZ threaded lens nut...
Make sure you keep us posted on your c-mount host, I'd like to see how you approach it!
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Old 04-23-2010, 06:09 AM #30
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Default Re: Getting a dot out of a 808nm bar diode....

I made this c-mount Kryton heatsink for digital_blue...
Kryton c-mount IR

I'm sure I could figure something out...

But in my experimenting so far, I find that I don't like not being able to see IR...

And when I use my IR glasses, I don't see anything at all. (but smoke as it burns)

Wish they had a high powered red diode...
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Last edited by jayrob; 04-23-2010 at 06:26 AM.
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Old 04-23-2010, 06:14 AM #31
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Default Re: Getting a dot out of a 808nm bar diode....

That shouldn't be too hard. I might try to make something like that, but I need to bone up on my mazatrol programming first
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Old 04-23-2010, 08:11 AM #32
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Default Re: Getting a dot out of a 808nm bar diode....

Very nice posts...that helps.
I was thinkin about using a fibre for beamshaping, but its not that easy to install a fibre.
Using a piece of a fibre as a "barrell"...that sounds way to easy. But if that would work...

Actually I wanna burn stuff on a distance. Just cant stand those crappy utube-videos showing burning lasers burning stuff, 20mm before the lens, anymore.
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