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Decoupling capacitor?

midias

midias

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Looking around the site I have seen a few people solder a cap between the anode and the cathode of their 405nm laser diodes. After searching I found 47nf to be a common value with some of the drives. What i could not find was info about the flex drive. I want my 445 and 405 to last a long time so I was wondering should I add a cap? I know transient spikes can be very hazardous to the 405 but I was more worried about my expensive 445nm build.
 





L

LSRFAQ

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May 8, 2009
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midias said:
Looking around the site I have seen a few people solder a cap between the anode and the cathode of their 405nm laser diodes. After searching I found 47nf to be a common value with some of the drives. What i could not find was info about the flex drive. I want my 445 and 405 to last a long time so I was wondering should I add a cap? I know transient spikes can be very hazardous to the 405 but I was more worried about my expensive 445nm build.
Click to expand...

Decoupling caps don't do much for you except on startup transients on poorly made drivers. If you want real protection, get a Lasorb(tm)

LASORB - ESD absorber for laser diodes

Steve
 
J

JonWienke

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midias said:
That what I figured looking at the scope but I figured extra protection could not hurt. Is there any argument not to?
Click to expand...

Only if you want to modulate your beam at high frequencies. A capacitor will mess that up.
 
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