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Old 12-26-2010, 12:05 AM #1
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Default Weird Effect around dot

Well I found some time to get a picture of what I see when I fire my 445 with a 445 glass lens. I tried swapping lenses with a brand new but no difference. It seems the radius of the emission is pretty big. What do you think it is? im talking about the scatterings to the left and right of the dot.

http://dl.dropbox.com/u/9693610/phot...s/100_1183.jpg


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Old 12-26-2010, 05:57 AM #2
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Default Re: Weird Effect around dot

It looks to Me like either a problem with the DIE or an issue with the coating on the diode window itself, but you probably already knew that. If you didn't worry about killing the diode you could carefully remove the window on the diode. I have a 445 that is missing the window, and it's still working fine.
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Old 12-26-2010, 06:30 AM #3
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Default Re: Weird Effect around dot

My 1.5w DTR build has had that since day one. I thought that maybe it is just a normal characteristic.
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Old 12-26-2010, 10:37 AM #4
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Default Re: Weird Effect around dot

Maybe some kind of a mod with thinner aperture would not let this side lide come off and leave the main beam exit only.
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Old 12-26-2010, 03:43 PM #5
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Default Re: Weird Effect around dot

Well the second 445 i built has the same effect and it was clean as hell. So I assume this is normal for these diodes..
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Old 12-26-2010, 03:46 PM #6
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Default Re: Weird Effect around dot

Silvershot I've not seen that effect in the few 445's I've worked with. Maybe one of our more experienced members will chime in.
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Old 12-26-2010, 04:06 PM #7
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Default Re: Weird Effect around dot

I as well am awaiting an explanation. Great thread.
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Old 12-26-2010, 04:45 PM #8
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Default Re: Weird Effect around dot

Sorry for the huge picture but using dropbox you cant resize pics while uploading and i was in a hurry. Btw, this effect can be dangerous even if you are not right facing the beam.
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Old 12-26-2010, 06:29 PM #9
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Default Re: Weird Effect around dot

This really exaggerates the effect you are talking about with the output of the Aixiz 445 Glass. All the ones I have seen have this.

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Old 12-29-2010, 04:07 AM #10
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Default Re: Weird Effect around dot

Jordan has spoken. That settles it in my book
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Old 12-29-2010, 06:28 AM #11
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Default Re: Weird Effect around dot

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Originally Posted by Ray J Neal View Post
Jordan has spoken. That settles it in my book
This is by no means settled and by no means passable either.

If there's that much artifacting around the beam, then there's clearly either a diode or lens defect.

In all of the 445s I've seen (One using an AixiZ full threaded glass, one using an AixZ half-threaded, one using an AixiZ acrylic, and one using an O-Like half-threaded), none have had so much trash around the beam itself.

Even though it's a messy multimode beam, it should never have that much splash around it, nor should it have separate 'sub-dots' branching off the main beam.

If that is the case, you're either dealing with a diode defect, or a lens defect.
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Old 12-29-2010, 07:33 AM #12
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Default Re: Weird Effect around dot

The half threaded from both Aixiz and O-Like are clean. Unfortunately Aixiz has stopped offering them and it is hard to keep some on hand when O-Like takes 2-3 weeks to get. Plus with the half threaded there is a bump in power. See my comparison thread. Aixiz 405 Glass lens vs Aixiz 445 Glass and 405-G-1 I will agree that I don't remember seeing as bad of splash on the early batches of 445's I had but I started using the half threaded exclusively wen I found out they delivered more power. Now that Aixiz does not carry them I have had to break down and get the full threaded ones to keep some lenses on had while I wait for some from O-Like. All of the full threaded I have gotten since they discontinued the half threaded have had this splash. Also remember it does not look as bad as the picture. The hole that lets all the light from the beam through and only shows you the splash. I have talked with Chuck and he is looking into it. He even sent me some replacements after our conversation but they were the same.
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Old 12-29-2010, 07:44 AM #13
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Default Re: Weird Effect around dot

Quote:
Originally Posted by DTR View Post
The half threaded from both Aixiz and O-Like are clean. Unfortunately Aixiz has stopped offering them and it is hard to keep some on hand when O-Like takes 2-3 weeks to get. Plus with the half threaded there is a bump in power. See my comparison thread. Aixiz 405 Glass lens vs Aixiz 445 Glass and 405-G-1 I will agree that I don't remember seeing as bad of splash on the early batches of 445's I had but I started using the half threaded exclusively wen I found out they delivered more power. Now that Aixiz does not carry them I have had to break down and get the full threaded ones to keep some lenses on had while I wait for some from O-Like. All of the full threaded I have gotten since they discontinued the half threaded have had this splash. Also remember it does not look as bad as the picture. The hole that lets all the light from the beam through and only shows you the splash. I have talked with Chuck and he is looking into it. He even sent me some replacements after our conversation but they were the same.
The half-threaded O-Like lenses are perhaps the best choice at the moment for a balance of power and beam specs.

Yes, the splash might not be bad when compared to the 405-G-1 (which, being a SFL single-element lens, picks up anything and everything), but it's still a pretty trashy beam profile.

It'd be easier to stock up on O-Like glass lenses, they aren't too expensive. Either way it'd be better than having a laser with such a dirty beam profile.
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Old 12-29-2010, 09:36 PM #14
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Default Re: Weird Effect around dot

light reflecting off of the inner diameter of an aperture. Now you just need to figure out if it's the aperture of the lens barrel, the output aperture, or something else.

People are saying that the aixiz full-threaded lens nuts are the culprit. I'll test my half-threaded o-like 405nm-optimized lens, only o-like one I have. I dunno why the outside threads would have anything to do with it...
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Old 12-31-2010, 03:38 PM #15
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Default Re: Weird Effect around dot

This phenomenon is present in most of these. It is more preonounced with some assembly/parts. Usually it is not a problem. However, if it stays the same, with differnt lenses, it is possible that there is an alignment problem with the assembly (module/lens/diode) or that the lens or the diode window itself got something on it.

Shine the laser at the wall and turn the lens. Do you see dark spots or other shapes moving/turning when you turn the lens? If so, there is something on the lens. Clean it.

If there is nothing on the lens, remove the lens and shine the laser on the wall. Do you see dark spots or other shapes (other than the evenly spaced lines that are normal) in the light? If so, the "noise" could be being produced by something on the diode window. Clean it very carefully.

If there is nothing on the lens or the window, it is either "normal" noise or an alignment problem.

Peace,
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Old 01-08-2011, 09:48 PM #16
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Default Re: Weird Effect around dot

Quote:
Originally Posted by daguin View Post
This phenomenon is present in most of these. It is more preonounced with some assembly/parts. Usually it is not a problem. However, if it stays the same, with differnt lenses, it is possible that there is an alignment problem with the assembly (module/lens/diode) or that the lens or the diode window itself got something on it.

Shine the laser at the wall and turn the lens. Do you see dark spots or other shapes moving/turning when you turn the lens? If so, there is something on the lens. Clean it.

If there is nothing on the lens, remove the lens and shine the laser on the wall. Do you see dark spots or other shapes (other than the evenly spaced lines that are normal) in the light? If so, the "noise" could be being produced by something on the diode window. Clean it very carefully.

If there is nothing on the lens or the window, it is either "normal" noise or an alignment problem.

Peace,
dave
From What I saw and considering the info you provided, it has to be a lens problem. I was sure about it anyway, because the diodes were bought from different sellers here and i always was really careful installing them in the module. I once cleaned a 445 diode window VERY carefully and tried again but the same effect was there. Maybe i have to clean the lens better.

Last edited by Elektrotechniker; 01-08-2011 at 09:51 PM.
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