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Old 04-14-2011, 10:17 PM #1
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Default Not happy with my new 445

So i got a new 445 diode off of ebay from danglasers. it said it was supposed to be a 1.5W diode. when i got it and installed it in my circuit it was fine it looked great i was pushing about 1W from it so one would think that it would do fine. and its not like I didnt heatsink it either. I had it installed in an old computer power supply heatsink. And wouldn't you know it but like 4 hours later the beam started to look funny like there was something on the lens. so i took the lens off and cleaned it and put it back in and it still looked the same. so i took the lens back off and looked at the diode and on the window it had burned a hole in the glass of the diode. now after using it for like another 15 minutes the diode has LED'd. So my point is why did this happen? the diode wasn't getting hot warm yes but hot no. how did a hole get burned into the diode? grr so frustrating especially since these diodes aren't cheap.


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Old 04-14-2011, 10:21 PM #2
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Default Re: Not happy with my new 445

Maybe a bad coating?

I know I have found on many of the a-130 LD's a discoloration in the coating
exactly the same shape of the raw beam. Perhaps this was an extreme example
of a similar problem..

Do you have close ups of the LD, im wondering what the shape of the hole is..
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Old 04-14-2011, 10:37 PM #3
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Default Re: Not happy with my new 445

Why didn't you just buy one from DTR of Daguin? danglasers sounds fishy to me just from their name
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Old 04-14-2011, 11:31 PM #4
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Default Re: Not happy with my new 445

Iam going with wannaburn on this one.

As well as what could have happened witch lots over look is when turning the lens to focus the laser some times very small pieces of the coating around the lenses threads start to wear/come off and when that happens it can drop on your diode window.

Once that happens you can kiss that diode goodbye as there is no way to clean that off a diode window if it burnt.

Unless you catch it Right away within a second & then you might get lucky and De-Can the diode and all should be good. But Highly unlikely your that Fast.
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Old 04-14-2011, 11:56 PM #5
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Default Re: Not happy with my new 445

Some debris/dust that baked on the diode window is feasible - once it burns down there, i can imagine it collects enough heat and/or reflect enough light back ruin the diode quite quickly.

I doubt the brand of the entire product had much to do with it, all these 445 nm diode are crapio 130/140 diodes with virtually no exception. The only problem with the host could have been that it didnt keep dust out very well.
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Old 04-15-2011, 12:12 AM #6
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Default Re: Not happy with my new 445

This is true as far as 'brand' goes, but there may be one exception..
The same way you can buy sleds with diodes that were 'rejects' or
factory seconds, maybe they have found a source of less than desirable
LD's...

Need some pics here...



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Originally Posted by Benm View Post
Some debris/dust that baked on the diode window is feasible - once it burns down there, i can imagine it collects enough heat and/or reflect enough light back ruin the diode quite quickly.

I doubt the brand of the entire product had much to do with it, all these 445 nm diode are crapio 130/140 diodes with virtually no exception. The only problem with the host could have been that it didnt keep dust out very well.
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Old 04-15-2011, 02:47 AM #7
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Default Re: Not happy with my new 445

I dont have any of the diode and i can't really give you a shot of the beam i mean take a blue led and put it in an aixiz module. plus my camera doesnt have a macro setting its just a video camera that you can take stills with.
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Old 04-21-2011, 11:28 AM #8
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Default Re: Not happy with my new 445

Ive bought an A140 diode from them and it works fine, no problems. Maybe you fried the diode or it was just defective
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Old 04-21-2011, 02:38 PM #9
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Default Re: Not happy with my new 445

if the diode sat out and collected dust before you installed in the module (either in your possession or the sellers) with a lens I could see it gathering a deadly amount of dust.
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Old 04-21-2011, 03:22 PM #10
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Default Re: Not happy with my new 445

I don't know if this is correct, but I remember hearing something about acrylic lens's not standing up to the 445nm diodes and just end up melting, then because not all the light can pass through the lens, it ends up bouncing back and essentially burning out the diode?

What kind of lens was used in the build?
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Old 04-21-2011, 05:09 PM #11
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Default Re: Not happy with my new 445

you say after 4 hours... i do hope you mean incl duty cycles
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Old 04-21-2011, 06:47 PM #12
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Default Re: Not happy with my new 445

does it look like this?
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Old 04-21-2011, 09:28 PM #13
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Default Re: Not happy with my new 445

yeah it kinda looked like that picture. And to answer the question i am using a glass lens. and no i didn't leave it on for 4 hours. it was dead within 4 hours of installing it in my circuit.
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Old 04-21-2011, 09:42 PM #14
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Default Re: Not happy with my new 445

Such marks on the window are normal, every diode has it.
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Old 04-21-2011, 10:31 PM #15
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Default Re: Not happy with my new 445

If thats it its most likely a burned coating on the glass, these diodes weren't designed and made to run at 1w +
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Old 04-21-2011, 10:50 PM #16
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Default Re: Not happy with my new 445

It's even on completely 'new' freshly harvested diodes.
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