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How to get unkown laser diode to operate

AquaticHarpy

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It died at 80ma, no longer pulling amperage. At 50ma it started dimming on camera
 



WizardG

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They sound like diodes for CD players.
 

FireMyLaser

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IR illumination or data transfer. Not burning or even a beam, unless you can remove the plastic enclosure and fit the diode in a proper housing.
 

FireMyLaser

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You confuse the colour with brightness before and after threshold. The real colour does not change. It is IR (or near IR).
 

FireMyLaser

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I have no good explanation for that behaviour. But it's likely above 700nm IR.

Otherwise it must have two dies and you somehow power both at the same time.
 
Last edited:

AquaticHarpy

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Could it just be a well built diode? This was a custom lot of 54 from a lab somewhere, maybe after pushing it so far it changes somehow
 

FireMyLaser

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My personal opinion is that you still only get one wavelength, just a jump in brightness. 0.4mA is extremely low threshold. I think 24mA is the actual threshold.
 

AquaticHarpy

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24ma is the jump where my ir camera no longer picks it up. 3-4 is the jump of large brightness
 

FireMyLaser

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If you feel sure that it change colour, then verify that the pinout can produce light in more than one way. You have six possible combinations, maybe you use one that's not the intended one.
 




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