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Strange effect with 445nm diode and driver.

Seoul_lasers

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So, I finally managed to pull off a 445nm in a MAXSINK. WOW!
I am impressed, however my driver went nuts trying to drive it at 400mA. I used a 6v PSU rated for 2.5Aamps. The diode pulled so much out of the driver the pot started getting too hot. At full power on the driver I got 4.6v @ 410mA. The output can burn/scortch dark paper at 15ft after about 4 seconds!
 

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Seoul_lasers

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A little note for safey. This is an example of what can happen with an unfocussed beam.

I used a black binder as a temp beamstop.

Voltage to diode was 4.6v at 405-410mA here. Shows you even at this power why eye protection and ALL flammables need to be well away from the beam. Output Iam guessing is around 390-400mW? If you know correct me.
I was using a 405nm coated o-like glass lens.
 

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millirad

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Nice job, I wondered what that type of psu would do with this diode. It's a current monster. Probably run ok at twice that rating.
 

Seoul_lasers

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What is "that" rating? Do you mean run it at 2W? or run it at 800mA?
I'd heard that the A103s would gladly take 1100mA at 4.3-4.5vdc
 

millirad

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No, I mean if your psu was rated for double it's capacity, 6V at 5A, as well as a higher powered pot. The current demand might have been met, and therefore keeping the forward voltage of the LD within specification as well. Still, we all enjoyed your experiment! kudos
 
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