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Old 12-12-2009, 06:10 PM #1
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Default Burned laser diode window still good?

Hi all,
Upon testing a bunch of 9mm high powered infrared laser diodes (at least over 1/2 watt, maybe more), I noticed that tha higher powered ones in the lot that I purchased from soneone seem to have a "burned" window or output lense or whatever you call it on the case.

When testing these diodes, I noticed that the ones what had these quite visible burn marks on the output windows turned out to be the high powered ones that burned right through 3 layers of electrical tape in way under 1 second when power was applied to the laser diode, lots of nice stinky smoke along with it...gag...lol.

What I'm wondering is if this blemish in any way inhibits the diodes performance in any way, or if it is a sign that the diode was abused in some way, or is on it's last legs or something.

Since I'm unfamiliar with this kind of thing, I was really just wondering what causes this to happen, and how it effects the diode, and what it says about the diodes condition and former use, as all of these diodes I've purchased are used in a lot of 40 or so.

I've noticed that the higher powered diodes with the burn marks on them in the lot that burned so much more quickly through the tape seemed to be the ones that were a shorter wavelenght of light, meaning that they were closer to visible light, and that the ones that the output beam was not visible whatsoever and seemed to be as high a power as the ones with the burn marks, did NOT have the same burn marks on the output window, this makes me wonder of it is light spectrum specific somehow?

Why would the laser diodes that were closer to visible light have burn marks on the output windows, yet the laser diodes that did not have a visible output to the human eye had NO burn marks on the output window, but appeared to be just as powerful?

Just wondering if anyone has any comments about this, I don't want to bother trying to use these diodes if they are damaged by this burning somehow.

I've attached a couple pics so you can see the burning, with the naked eye, you can see much more texture than you can in the photos, I've tried to show it as best I can, thanks!





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Old 12-12-2009, 06:52 PM #2
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Default Re: Burned laser diode window still good?

Clean it with a q-tip and windex.
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Old 12-12-2009, 10:14 PM #3
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Default Re: Burned laser diode window still good?

Are you being serious, or sarcastic?
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Old 12-12-2009, 10:39 PM #4
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Default Re: Burned laser diode window still good?

Quote:
Originally Posted by canpower View Post
Are you being serious, or sarcastic?
He's being serious. It is doubtful that the "burn" is inside the diode. Something probably burned onto the outside surface of the window.

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Old 12-12-2009, 10:58 PM #5
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Default Re: Burned laser diode window still good?

Kewl, who would have guessed!

Sorry for suspecting the sarcasm, nothing offensive intended, I just need to know someone's being serious before I take their advice

Thanks!!
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