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Unknown chip on diode

Exerd

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Jan 2, 2010
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I was examining an 808nm diode from a very old laser tonight, and I noticed a small chip onboard which I had not seen before on a diode. I thought that it might be a capacitor, or maybe even a photocell for feedback. Hoping for someone to confirm. :yh:

20nsk6.jpg
 



HIMNL9

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May 26, 2009
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It's a photodiode.

It takes the light from the back of the chip, and is normally used in "feedback regulated drivers" for read the output power and regulate the current.
 




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