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Old 08-12-2010, 11:16 PM #1
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Default 445nm splash

Hey.

Just got my first 445nm (447nm CNI) laser. Beautiful wavelength!

Just curious about your experience with splashing from these diodes?

See the attached picture. It looks a bit worse than it actually is due to the dot is pointed to a black surface on a white paper around it. But shows the "problem".



Dirt on the lens? ^^

Sorry for picture quality. iPhone camera. Only thing available atm.


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Old 08-12-2010, 11:28 PM #2
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Default Re: 445nm splash

The elongated beam will reflect off of the inside of the module and the aperture of the lens.
What you see looks "normal."
It could also be internal reflections in the lens elements.
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Old 08-12-2010, 11:38 PM #3
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Default Re: 445nm splash

Or it could be the didn't press the diode if perfectly straight since the splash is only on one side....
It is normal to have the splash around the dot, but it looks like its just off to one side in the pic.
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Old 08-12-2010, 11:42 PM #4
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Default Re: 445nm splash

What lenses? it look odd, i dont see any line in the dot.
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Old 08-12-2010, 11:43 PM #5
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Default Re: 445nm splash

well, I have it more or less equally on either side of the main rectangle. its not dirt since it doesnt rotate with the lense. The only way I can think of fixing it is to use a lense with a further focal point. then it can be screwed in further for the same effect.
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Old 08-12-2010, 11:45 PM #6
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Default Re: 445nm splash

Thank you for your replies. Feels good that it's normal. Too bad that I cannot do anything about it.

Perhaps I can coat the inside of the front part of the head with some black soft material absorbing the splash?

The laser have about 3-4 cm (1.18 - 1.57in) free space from diode to the exit aperture.

Then again the black material cannot melt or burn inside there. :>

Ohwell. Again, thanks.

Mikael
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Old 08-12-2010, 11:47 PM #7
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Default Re: 445nm splash

Quote:
Originally Posted by rangedunits View Post
What lenses? it look odd, i dont see any line in the dot.
Not a clue what CNI use for lenses.
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Old 08-13-2010, 02:55 AM #8
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Default Re: 445nm splash

Do you think the splash is caused by the slits in the lens?

http://laserpointerforums.com/f52/if...-53680-12.html

see post 278, thanks ppctx

Last edited by ZapU; 08-13-2010 at 03:03 AM.
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Old 08-13-2010, 03:16 AM #9
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Default Re: 445nm splash

^^ This is not the Arctic. It is the CNI 447nm laser.
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Old 08-13-2010, 04:00 AM #10
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Default Re: 445nm splash

I have similar aberrations with one of my low power, ~200mW, builds. Still visible when the lens is removed so I think it's actually reflection from the sides of the window as the diode is pressed in just fine to the Aixiz module it's in. More annoying are reflections in a high power, ~1,350mW, build that seem to be from small solder blobs on the front of the die casing. I'll try to get some pics when it comes back from testing.

Annoying but hey, it's blue!

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Old 08-13-2010, 04:12 AM #11
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Default Re: 445nm splash

Quote:
Originally Posted by lazeerer View Post
^^ This is not the Arctic. It is the CNI 447nm laser.

Been bouncing around reading different threads, my bad.
Obviously, I have the same problem with the Artic. I'll take it to the appropriate thread.
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Old 08-13-2010, 07:45 AM #12
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Default Re: 445nm splash

would require that the interior housing and the edge of each lens is flat black paint and may also be reducing the output beam

Last edited by Firefly; 08-13-2010 at 07:48 AM.
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Old 08-14-2010, 03:18 AM #13
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Default Re: 445nm splash

^It's not the lens. I get the same aberrations without any lens at all.

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