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E-bay Green Module - Not Bad!

 





Tech_Junkie said:
1. http://laserpointerforums.com/f39/green-laser-modules-huge-blowout-sale-l-k-49629-5.html#post684612

2. http://laserpointerforums.com/f39/green-laser-modules-huge-blowout-sale-l-k-49629-5.html#post684718

3. Watch his video, at the end when he looks through his goggles. The halo is plainly seen. http://laserpointerforums.com/f39/green-laser-modules-huge-blowout-sale-l-k-49629-5.html#post684751
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1: That's the same one as he was talking about here.

2: That's 2 total. But who knows if that's the same problem or not. Maybe the poster could give an image or 2? He certain;y doesn't seem worried about it, since he mentioned it once in passing.

3: I may be wrong, but that shot looking through the goggles kinda looks like IR to me, not green light. Maybe the guy who made the video could tell us which it is? The green in the immediate prior shot, as he is putting the glasses on the camera, doesn't say much, as the green is saturating the camera and messing up the image. You can see this as the green area shrinks/changes as the camera adjusts to the over-saturation just before the glasses go over the lens.

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Either way, nex has an excellent point that the laser was working when it arrived, per the customer, and then changed. I've seen it posted many times on here when unknown buyers accuse respected sellers of similar shinanigans that lasers are sold as-is and no warranty can be implied or expected, except when clearly stated. Why should that expectation get turned around otherwise?

And also either way, mine should be in the mailbox waiting for me when I get home, I'll let you know how it looks soon.
 
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Looks like a halo to me. No one said anything to the contrary when I posted that on the other thread. I've never seen IR that looked like a hoop before. Its always more of a splash, but I could be wrong. Plus that kid is a n00b, like most of the others who bought these. I doubt he would know what he was looking at either way, or even care. Most people are happy it just burns, as you well know.

Point is still made, its more than just one module, and not just Chalkboards. So if two, and possibly one or more had this defect, then Chalkboard should get a replacement, or at least some money off. Its does not matter how Chalkboard acted, the seller is responsible for the item described. No?
 
Tech_Junkie said:
Looks like a halo to me. No one said anything to the contrary when I posted that on the other thread. I've never seen IR that looked like a hoop before. Its always more of a splash, but I could be wrong. Plus that kid is a n00b, like most of the others who bought these. I doubt he would know what he was looking at either way, or even care. Most people are happy it just burns, as you well know.
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Chalkboard said his module worked when he received it, then it did this. Something changed, so we know that much.

Why doesn't one of our DPSS experts chime in. What could change in a 532nm laser, just from standard use, that would result in the almost fingerprint-looking artifact around the beam which has resulted?

The same low-quality photo is posted again here, maybe we should get another from him.

Chalkboard, can you post a new photo with a quality camera, or just a new photo since you attempted to clean the laser?

One last thing. Chalkboard still hasn't told us what surfaces of the lens he cleaned. Maybe he cleaned only the front lens.

Are you capable of cleaning the other surfaces, Chalkboard?

Tech_Junkie said:
Point is still made, its more than just one module, and not just Chalkboards.
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I don't see any resemblance between them. One developed a "fingerprint" artifact, one has a halo which can be common. I don't think it is fair to generalize any and all distortions as the same problem.
 
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Exerd said:
I don't see any resemblance between them. One developed a "fingerprint" artifact, one has a halo which can be common. I don't think it is fair to generalize any and all distortions as the same problem.
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There could be a lot of different reasons why this is happening. The second person didnt post a picture, he just said "halo" and that it might be under powered. The third picture was viewed through goggles. It looks to me that it might be a crystal problem, or its letting a huge amount of IR leak. Either way there are possible 2 or more defect modules.

And my DX 20mW has no halo, so I dont know how common it is. How many green DPSS do you own, and how may have halos?

We are getting away from the original point. He said he only knew of one with the halo effect. When in fact 2 people posted on his sales thread that they had a "halo".

I'm just weeding out the BS.
 
I'm by no means a "DPSS Expert," so take what I say with a grain of salt, but I think that lens is the final collimating lens that affects the focus of the beam AFTER it has exited through the OC. Therefore, as long as you screw it back in to the same spot (easier if you leave the threadloc on the two parts) it should be back at the same focus. Heck, you might even be able to focus it better than the factory!

Something to look for if you decide to clean the other side of the lens, is see if the pattern rotates or morphs with the lens' rotating motion. The dot will get larger, that should happen.

I understand your hesitation about opening these, these DPSS are way more complex than the standard diode-collimator setup. If you DO decide to do this, look around for some lens-cleaning tips. I can't remember any of them other than the obvious one: don't use a lint-y q-tip, and don't double-dip in the cleaner.
 
That's up to you. I think if he refunded you $10 would be a better solution. But that's just my opinion.
 
^That sounds like it could possibly be a reasonable deal to get $10 or $20 back, at least if I was the seller.


Just an update for me, I received my module today. Super-fast and very well packaged. Honestly, packaged as well as any other laser I've ever received, and better than most of them.

I'm an idiot and forgot that half my tools (multimeter, safety glasses, the requisite battery packs, several other things) are in my desk at work, so I can't test it tonight like I had hoped.

But I did just hook it up to a CR2 real quick to make sure it lases, and sure enough it does. No obvious splash at first glance, power looks ok to a first approximation. But I'll check a lot closer, for splash and power, once I have my glasses and other stuff later.
 
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Tech_Junkie said:
And my DX 20mW has no halo, so I dont know how common it is.
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That seems to cover the vast majority of green lasers out there, so I'll take your word for it. :beer:

Chalkboard said:
If i try it and screwit up , i wouldn't expect the seller to refund/return/replace the module. But in this case he asked me to clean the inside of the lens. I will try it and it if it still isnt up to par , i will send it back and open a PP dispute.
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Chalkboard said:
Well lets see if he wants to respond.
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Take the lens out and clean the thing. What more do you have to lose? Based upon what has been written, nexbox360 has already given his response.

Sorry to sound harsh on you, but sometimes you got to step up and solve your own problems when other people aren't solving them for you.

I can't help but admit that your situation as described sounds fishy. It worked, then it changed pattern, and now you'll be happy with a $20 refund and keeping the laser... :thinking:

Again, I know things aren't always as they seem, but there is simply very limited (no) evidence here that the seller is the one at fault.

If I had sold you the laser, I would tell you to send me the laser and I would inspect it for you. Based upon my findings, I would then determine if a refund or replacement is warranted.

I suspect that a polite asking of this in the beginning may have resulted in those very results.
 
Well, if you haven't taken the lens off just yet, perhaps nexbox could fix things up. He said that he sends the rejects (that he rejects) back to the factory, and that they don't seem to mind. Perhaps he would be willing to return that module for you as defective and get a replacement? I think it would be a huge plus for his reputation if he went this far to replace this. I do see a faint halo around the dot on my module, but not bright enough to be distracting. I will keep my eye on it and see if it gets brighter with time.
 
Exerd said:
That seems to cover the vast majority of green lasers out there, so I'll take your word for it. :beer:.
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I was quoting from my own experience. You never answered my question.

Oh yeah, and being on this forum for 15 months, with well over 4000 posts, I've seen a few 532nm output photos in my time. Halos are not common. :beer:
 
Tech_Junkie said:
I was quoting from my own experience. You never answered my question.

Oh yeah, and being on this forum for 15 months, with well over 4000 posts, I've seen a few 532nm output photos in my time. Halos are not common. :beer:
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Congratulations on the giant e-peen you have grown. :)

I really don't care how many posts you have managed to conglomerate, or what you choose to acknowledge.

It is by the nature of the circular shape that a halo can be produced when a lens is improperly cleaned. :rolleyes: Based on the alleged amount of people who may not be cleaning their lenses correctly, I would consider that outcome a common possibility.

Carry on in the mysterious lens catastrophe. Best of luck in your quests. I hope the disaster doesn't end any laser addictions, and that we all remain in synchronous photonic harmony in the end. :gh:
 
Sadly, I have concluded that the halo is due to running the module with no duty cycle or rest time. Perhaps crystal or facet damage? The halo appears within a 5 second period after running the module for a while. Cooling the module after the halo has appeared has no effect. The module was not used for burning at the time the halo appeared.

I imagine running any module unheatsinked for too long will damage it. Completely built-out lasers have heatsinked hosts with plenty of mass, and they still often recommend a duty cycle of 50% with max pulse width of 30 or 60 seconds, it stands to reason that an unheatsinked module will see damage before that.

Serves me right for messing around with it too much :mad:

But anyways, that's my findings. It still feels really powerful. Haven't really attempted to burn stuff that often, so I can't say about whether it's increased or decreased in power... Anybody with a power meter live near me?:whistle:

Edit: also, doesn't look like TEM10 (or whatever the one is with a dot and a circle around it). the halo is huge in respect to the dot. Think of a bb with a Krispy Kreme around it.
 
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Man sorry to hear that. At least we know that a strict duty cycle needs to observed, and its not a dirty lens.

Where do you live? Maybe we can find someone to test it for you.
 
So it sounds like the crystal is heating up then shifting out of position. maybe it moved forward and that is way there's a halo.
So i would think the power would drop dramatically if it is indeed the crystal. Any one ever tried to re align?
 
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