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ArcticMyst Security by Avery

Mitsubishi 300mW - Died at 1A?

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Hey everyone.

I just got a Mitsubishi 300mW for my first 635nm build (was building it for sale) and I was under the impression that 99% of these diodes can handle 1A of current. Is this true? Right when I hit 1A, I got the dreaded dimming. I immediately lowered the power and it still lases, its just zombied now (is this normal for these too?). I was under the impression that these were as durable as the 445s when it comes to dimming, etc.?

Maybe I was just too ambitious with this diode?
 





Blord

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If the diodes are overdriven there is a chance of failure, no matter how small the chance is. They can even fail at nominal current. You just hit that 1%. :(

My Mitsubishi diode at 1050mA is still running fine. I feel sorry for you losses.
 
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joeyss

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You could of gotten a poor efficiency diode that just fried itself...it happens sometimes... after all there's alot of luck involved in LASERS.
 
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poor you (and diode). mine is driven at 750ma and runs fine, but i dont even think about cranking up the current.
 
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Yeah :\ Ah well. Next time I'll ramp it up more slowly and get readings to make sure it's not poor efficiency. Also, limiting the current to 854mA may help :p
 

Johnyz

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I'm running mine at around 600mA on a custom LM3405 buck driver and getting around 500mW. I did it before RHD started selling these 1A kits and everyone was careful with them back then. It still happily lases.
 

DTR

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I normally recommend 750-800mA as a max but not really for fear of burning it out but that is where I think it can run for a minute pretty stable with a good heatsink and not have the wavelength shift too much.:beer:

I am sorry for your loss. It really is no fun having the built up anticipation of a sweet build crushed by a loss.:yabbem:
 
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The fact that we're lamenting the loss of a 635nm diode dying at over an Amp of current--as a somewhat unnatural event--really shows how far we've come.
 
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Yeah - DTR, I noticed you cancelled the shipment of the second diode (I'm "Robin Blitz" - that's my mom's name :p ) and immediately sent another shipment or something?

Anyway, yeah, I am going to stick with .854A this time, assuming it's an efficient diode. May even lower the current further, depending.
 

rhd

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I'm running mine at around 600mA on a custom LM3405 buck driver and getting around 500mW. I did it before RHD started selling these 1A kits and everyone was careful with them back then. It still happily lases.

I don't think I ever sold 635nm kits... ?!?
 

DTR

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10mW blu-ray box-type lasers @ $155 (2007)

http://laserpointerforums.com/f39/bluray-box-24794.html


Peace,
dave

Yea but you could overdrive them to 15mW.:rolleyes:

Check out this sales pitch.:p
Probably around 10mW... but considering how bright it seems compared to my last one, I wouldn't put it past it that it's 15mW or so. :cool:

--DDL




Yeah - DTR, I noticed you cancelled the shipment of the second diode (I'm "Robin Blitz" - that's my mom's name :p ) and immediately sent another shipment or something?

Yea I printed the shipping label with the wrong weight so I voided that label and printed another.:beer:
 
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My 635 went Dimmmmmmmm mode at 946ma, I suggest 700ma
I knew it could or would happen, I didn't GAF
 




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