Just a reminder, the primary cause of 'death' of these diodes is a slow steady degradation in power, it takes a lot to get them to turn into a LED/DED like the diodes extracted from computers do.
This effect can be seen in my testing at 445nm laser diode
If you look on the long term graph at http://www.krazerlasers.com/lasers/445nm/diode-week.png
(note that the graph is 'backwards' the end it the test is at the left of the graph)
1. the more or less constant power on thursday/friday was with the current set at 1.5A and the diode mounting block at 30C
2. The current was increased to 2A saturday night, which caused a spike in power. The steady decline afterward was the diode slowly being damaged.
3. The logging software went nuts monday morning, and caused the graph to read a continuous 1.3w for a few hours
4. The problem was remedied and the current reduced to 1.5A again for the duration of the test, which ended tuesday just before the final dip in the graph which was when diode was shut off.
This is reckless, if you will increase current each day we won't be able to know at what point it dies, by testing diode you must stay at the same current level, it won't give any data AT ALL if it dies, there is no point in such action, it's just 24 hours which is nothing, diodes are meant to last at least 10 000 hours, so for example if it dies on 1.5A after 24 hours we will only know that it will be running for 24 hours at that current level and then die.
I suggest to run it at 1W output current, let's say it's 1A, so full test for a month (running 24/7/30) it will be 5040hours online, if it's survive, you will provide unbelievable usefull informations.
But since it's your diode, it's your call, I would like to do the same if I will get more diodes.
I turned the laser off this morning after about 84 hours. The last 36 hours the diode ran @ 1.4 amps. As you know I dont have a LPM so I guesstimated the output by "feeling" the heat on my hand. I'd be very surprised if the output did drop substantially because it still burnt the crap out of me. Of coarse there is no way I could tell if it did drop 10 percent.
So....I'm going to lock the laser in the cupboard tonight, setting the current to 1 amp. I'll leave it for the month.
Off topic: I'm ordering a PBS for $50 coated 400-600nm from Crylight.com Going to combined two laser and hopefully get about 2+ watts out. Does the price sound about right?
Try keeping the current the same, but cycle the power on/off with 20 seconds on and 20 seconds off and see if it'll pass this kind of test for 24-48 hours.
It's not difficult to make a simple timer circuit to cycle the power.
This would be a much more real life type test as most people will use them as pointers and be turning them on and off hundreds of times. It's also a good test to help determine actual lifetime as most of the stress is put on the diode with the initial inrush of current when turned on.