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Old 11-05-2011, 10:42 PM #1
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Default Running A-140 diode @ 1.25A is it safe?

I have read about how much these diodes can vary in power and some are better than others. I have seen a lot of posts of people running them at about 500mA is there a reason they are not taking it higher? I have a big heatsink and running it off a LM317 driver with 7.4V at 1.25A. Is it safe, or will the diode die and is it risky?

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I am going to be building a 1.5W 445nm laser in a few months. I am also building a 120mW green 532nm.



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Old 11-05-2011, 11:12 PM #2
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Default Re: Running A-140 diode @ 1.25A is it safe?

The 445nm diodes can even run at 1.8A! Good heatsinking is necessary.

Look this thread if you want to know more about 445nm diodes List of 445nm diodes
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Old 11-05-2011, 11:15 PM #3
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Default Re: Running A-140 diode @ 1.25A is it safe?

Quote:
Originally Posted by Blord View Post
The 445nm diodes can even run at 1.8A! Good heating is necessary.
Careful when running them at 1.8A though, some select diodes can't handle that much current.
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Old 11-06-2011, 12:03 AM #4
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Default Re: Running A-140 diode @ 1.25A is it safe?

I think the 1.25A range seems to be the sweet spot that many of the lasers sold around here are set at. Should give you a decent output and still a long life.

From what I understand 1.8A is the max for these and as said above, may shorten the life of the diode if it doesn't fry it right away. Even as low cast as they are, I won't ask anyone to set one that high for me in anything I am buying.
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Old 11-06-2011, 12:10 AM #5
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Default Re: Running A-140 diode @ 1.25A is it safe?

Why would you use a lm317? Lol, atleast use a lm1117
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Old 11-06-2011, 01:13 AM #6
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Default Re: Running A-140 diode @ 1.25A is it safe?

It doenst matter what you use to regulated the current though, 1 amp = 1 amp.

As for the current powering these diodes (provided there is ample heatsinking), i'd say that 1.0 amp is a relatively safe current that will produce a good amount of power without degrading the diode.

I guess 1.25 amp may be popular because it almost always results in a laser that is 1 watt or more, and doesnt tend to blow out the diode quickly.

1.8 amps is pushing for maximum power, and i would not recommend that for long diode life or continous operation.
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Old 11-07-2011, 06:52 AM #7
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Default Re: Running A-140 diode @ 1.25A is it safe?

Thanks everyone for this Info I have put another thread up called "I have built my first 445nm but...." I am having issues with the right current.
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I am currently new to lasers, i have:

LPC 815 DIY 280mW 650nm Click me
2x DIY Red 5mW 650nm
Small 1mW red 650nm
DIY 240mW pulsed red 650nm
DIY Green 5mW 532nm

I am going to be building a 1.5W 445nm laser in a few months. I am also building a 120mW green 532nm.



Click me to Donate to me please Everything helps for me to save and review more lasers
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