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Getting a dot out of a 808nm bar diode....






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ElektroFreak

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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.
 
jayrob

jayrob

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Ok... thanks for the information...

I guess I had already gathered that, but just hoped that you knew something different...
 
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ElektroFreak

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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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jayrob

jayrob

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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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ElektroFreak

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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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Pontiacg5

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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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Pontiacg5

Pontiacg5

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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 :D
 
AnselmoFanZero

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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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