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Max Current/Voltage for 1 Watt 445nm

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May 19, 2011
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I recently bought the 1 watt 445nm LD from Modwerx and i was wondering what the current and voltage specs are that will give you the highest power output w/o damaging the LD. Any input appreciated.
 





voltage: about 4.5V DC
current: somewhere between 1000mA and 1500mA.

It's all in the forum though if you had UTFSE.;)
 
Is the 4.5 Volts the voltage across the LD when connected or the open circuit voltage at the output of the driver?
 
Like the man said, "It's all in the forum though if you had UTFSE."
If you are using a Boost driver, you do not ever, ever, want to apply power with the driver unloaded (output open circuit).
 
You can see over 5.0 volts on the diode when it's at 700ma and above.
I would not push the diode higher than 1000-1400ma and only with the best heatsinking.
They are run at 700ma or so in there original use in projectors.

Peace All...
 
Its always a trade off between power and diode life, so you need to pick conservative or performance at some point.

I'd say 1.0 amp is a good choice that will give you about 1 watt of power output, with good diode life as long as you provide proper heatsinking. Don't worry about the forward voltage, that should end up somewhere between 4 and 5 volts at that current. If its over 5 volts, you may had a bad diode.
 
When you talk about term life, what time do you mean?
Dozens of hours and hundreds or more?

Why diodes are dying? There's something to burn out?
 
Ive got a few 1.1 watt blue lasers and they draw just over a amp ,they don't get warm well the host doesn't. And the duty cycle is around 2 mins on 1 min off and had them for quite a while no issues if that helps at all .of course you only know you have and issue generally when it blows, by then too late.
 
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