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Strange green light from IR diode...

ReNNo

ReNNo

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Eudamonium send me some spare 9mm IR diodes he had so I can test them and find practical use. (Thanks Eudaimonim, and thank to Bill who supplied Eudaimonium with diodes :) )

One of these diodes emits very, very dim green light that can only be seen in dark room when light is focused in small dot.

It looks like 1000+nm laser diode but I'm not sure because I don't have spectrometer.

Maybe that green dim light can give me information about wavelength?
Any ideas about this?

btw...diode works on 1.4A and can burn better than my 808nm (1.25A) laser diode.
 





bloompyle

bloompyle

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Very odd.... Can you look into the components (WHEN ITS OFF!!) and see if it looks different? I know that I now have a magenta, violet, and yellow-ish white diode because when I was knocking it out of a housing (it was a really dim PHR) I broke the circuits, so now it's just a stripe with different colors (very dim), pretty cool, I plan on keeping it. Anyway, this mighta happened to yours, a slight mishap with the circuit board, and now you have a green.
 
ReNNo

ReNNo

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I don't think so.
It's very powerful diode, doesn't look like damaged.

Here is the picture...

On left side is that mysterious diode and on the right side is 1W 808nm diode.


And here is chip of the diode...
 
Kenom

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I too have experienced a green appearing laser coming from a High IR laser diode. I seemed to have experienced it when it was shining on a white peice of paper.. maybe flourescence? I killed the diode so havn't got it to play with or take pictures of, and mine was a c-mount and not a 9mm.. but it was cool.
 
Flaminpyro

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If you want to send it to me I will put it under the microscope and get some pictures, then send it back of course ;)
 
ReNNo

ReNNo

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Kenom said:
I too have experienced a green appearing laser coming from a High IR laser diode. I seemed to have experienced it when it was shining on a white peice of paper.. maybe flourescence? I killed the diode so havn't got it to play with or take pictures of, and mine was a c-mount and not a 9mm.. but it was cool.
Click to expand...

This green light can bee see on any surface, for my eyes doesn't look like fluorescence.
Do you know what wavelength was that diode?

Flaminpyro said:
If you want to send it to me I will put it under the microscope and get some pictures, then send it back of course ;)
Click to expand...
Was that question directed to me?

If yes...sorry....I pressed diode into module, and module into heatsink...removing it all would be tricky.
 
ReNNo

ReNNo

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I knew someone is going to ask that...
That is what I thought at first place. But it's not light from LED.

I can see that this light goes out of module.
In dark room you can easily see that this small dim dot changes its shape when I turn focus ring. And all burning power is concentrated in this dim green dot.

That is the same as dim red dot from 808nm laser but hardly to see, and it's green instead of red.
 
HIMNL9

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ReNNo said:
That is the same as dim red dot from 808nm laser but hardly to see, and it's green instead of red.
Click to expand...

Oh, then is just infragreen ..... just kidding, ok ? :p :crackup:

Seriously, no, then i don't imagine from where it can came ..... secondary resonance in the cavity ? ( but it must be practically impossible ..... :confused: )
 
ReNNo

ReNNo

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Yes... it must be infragreen, what else :), hahaha

I'm waiting answer from Kenom...Maybe he knows wavelength of this diode..
 
billg519

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I have a 960nm c-mount that gives a faint blue light as well as the IR. This is perhaps due to traces of impurities in the diode allowing the generation of some microwatts of non-laser visible light.
 
ReNNo

ReNNo

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So that is it...

Does it mean that this dim light cannot reveal what wavelength that diode is?
 
Eudaimonium

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ReNNo said:
So that is it...

Does it mean that this dim light cannot reveal what wavelength that diode is?
Click to expand...
Didn't you say the the green light only occurs in perfect sweet spot focus when burning stuff?

If no, Bill is right, some impurities can occur...
Or not? I mean, if an impurity can cause green direct diode light, one owuld think the indutry would exploit that to produce green diodes themselves (already).
 
ReNNo

ReNNo

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If it's dark enough I can even see unfocused green light.

This is not clear green color, it's something between green and blue. (Something like color of VFD displays ..505nm)
 
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