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Old 07-22-2013, 04:43 PM #1
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Default Green light from A140/M140 diode

Hey all.
Something weird happened some days ago.

I got a blown A140/M140 (don't know) and direct-drove it with a 3000mAh Li-ion battery...
WITHOUT A MODULE. Just the bare diode.
It was COD'd anyways. So I just saw that round, weak, blue emission.
Thats fine.
After some time the diode started to smoke, but still on (tough, uh?)
and I saw the colors shifting to what I though to be around 500/510nm (green).

A friend of mine (registered here, but lurker) was beside me and saw it too.
We were amazed btw...
BUT after we turned off the diode and turned it back on, the blue emission was back, except for a small line (one of the multimode fringes) that were still green.
The diode fully died on the second run...

I don't think I know what happened there..

I was thinking if one could heat the diode (not by driving it >2A, that would damage the facets and mirrors inside) to shift its color beyond it would... or cool it?
I know the wavelengths shift. I just didn't know if this effect could be permanent.

Seems like I'll need to build a spectrometer. Already have something in my head...

Thanks for reading.


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Old 07-22-2013, 06:32 PM #2
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Default Re: Green light from A140/M140 diode

doesn't really surprise me.

you also see green and purple lines if you shine one through diffraction grating at just below lasing threshold.

it's just funkyness in the bandgap, but kind of neat.

Quote:
Originally Posted by Leodahsan View Post
Hey all.
Something weird happened some days ago.

I got a blown A140/M140 (don't know) and direct-drove it with a 3000mAh Li-ion battery...
WITHOUT A MODULE. Just the bare diode.
It was COD'd anyways. So I just saw that round, weak, blue emission.
Thats fine.
After some time the diode started to smoke, but still on (tough, uh?)
and I saw the colors shifting to what I though to be around 500/510nm (green).

A friend of mine (registered here, but lurker) was beside me and saw it too.
We were amazed btw...
BUT after we turned off the diode and turned it back on, the blue emission was back, except for a small line (one of the multimode fringes) that were still green.
The diode fully died on the second run...

I don't think I know what happened there..

I was thinking if one could heat the diode (not by driving it >2A, that would damage the facets and mirrors inside) to shift its color beyond it would... or cool it?
I know the wavelengths shift. I just didn't know if this effect could be permanent.

Seems like I'll need to build a spectrometer. Already have something in my head...

Thanks for reading.
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Old 07-23-2013, 04:45 PM #3
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Default Re: Green light from A140/M140 diode

Not useful at all you would say?
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Old 07-23-2013, 04:46 PM #4
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swamidog swamidog is online now
Class 2 Laser
 
Join Date: Aug 2009
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Default Re: Green light from A140/M140 diode

i think it's neat, but not useful.

your milage may vary.

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Originally Posted by Leodahsan View Post
Not useful at all you would say?
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