Is this a sign of the diode degrading?

• Aug 9, 2010

• #1

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trinity_2200

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I discovered these "ripple" like pattern when i defocus my laser, at first i thought my lens is scratched, so i remove the lens completely and i still see the pattern, is this a sign of my diode degrading and going to die soon?

 

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• Aug 9, 2010

• #2

Scottyzedinosaur

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what lens are you using, and what current are you running your diode at?

 

• Aug 9, 2010

• #3

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trinity_2200

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i'm using 405-G-1, using microboost set @ 1A

The photo was taken with the lens removed

 

• Aug 9, 2010

• #4

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JonWienke

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Probably not. Most 445nm diodes are multimode, so seeing interference effects in the beam is normal.

 

• Aug 9, 2010

• #5

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Things

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That could have multiple explanations, but not likely a degrading diode.

The bar patterns are a result of the multimode diode.

The ripples could be defects on the cavity mirrors, but more likely the diode window.

Nothing to worry about, almost every diode has those artifacts.

 

• Aug 9, 2010

• #6

magonegro

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My two diodes have the same ripples more or less, this is pretty normal, I have seen this artifacts even in single mode diodes, I always thought it was normal. If there had been COD probably you will see holes in the radiation pattern.