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Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > 445nm Lasers



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Old 08-09-2010, 10:52 AM #1
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Default Is this a sign of the diode degrading?

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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Old 08-09-2010, 10:54 AM #2
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Default Re: Is this a sign of the diode degrading?

what lens are you using, and what current are you running your diode at?
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Old 08-09-2010, 10:58 AM #3
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Default Re: Is this a sign of the diode degrading?

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

The photo was taken with the lens removed
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Old 08-09-2010, 11:00 AM #4
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Default Re: Is this a sign of the diode degrading?

Probably not. Most 445nm diodes are multimode, so seeing interference effects in the beam is normal.
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Old 08-09-2010, 11:04 AM #5
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Default Re: Is this a sign of the diode degrading?

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.
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Old 08-09-2010, 04:55 PM #6
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Default Re: Is this a sign of the diode degrading?

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.
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