462nm Laser k/o !!!

[Alien Laser]

So i build this 462nm laser and it worked fine i set the driver to 1.4A the driver is a boost driver it worked fine today i decided to use a Efest battery and the diode dimmed immediately i check the amp and it was around 1.5A i also tested another M140 diode and it works perfect are this boost drivers bad what killed the diode i have more just no idea if i should use the same driver or a X-Drive and set it at 1.4A, Last image is yesterday when the laser worked perfect

 

[Z80 Lasers]

Try checking the output voltage of the driver without a load connected. If it's boosting the voltage too much it could have zapped the diode. Too much noise on the output could also fry it.

 

[Alien Laser]

I did the voltage is 5.67V i tested both batteries
strange

 

[paul1598419]

You know those XXXfire batteries are often far below their ratings.

 

[WizardG]

You know those XXXfire batteries are often far below their ratings.

I think this is likely the issue. If you set the current using the xxxfire cell the sag in battery voltage may have fooled you into turning the pot a little too much. Then switching to a GOOD battery popped your diode because the good battery was able to deliver its rated voltage into the load.

 

[Alien Laser]

You are correct I checked XXX-fire batteries reading is 1.4A I tested 4 Efest batteries and some AW the reading is 1.6A 5.6V,5.5V i used the Efest and set the driver to 1.4A and i switched the battery using the XXX-fire and the reading was 1.28A 5.5V the drivers max is 1.8A the diode i used NDB7675 i just received 10 of this diodes i have another build X-Drive and it’s set at 1.8A and no issues i remember testing one years ago and the can handle 2.4A in a good heatsink

 

[paul1598419]

Years ago I puchased five M140 diodes new and with unsoldered on pins, full length for $40.00 each. I never tried runnig them harder than 1.8 amps though. That was pushing them hard enough. Still got the one in my signature doing better than 2.2 watts.

 

[Alien Laser]

Still no clue why the diode just dimmed see the 3rd image this is when the diode was dimmed maybe it’s a bad diode i also used a spring yesterday and it reflected back and it still worked today and , I will build 440nm 6W first and do another NDB7675 i have all this diodes brand new
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Update this 1 diode came from OpticsLD and i just compared it to other NDB7675 diodes i purchased from DTR and one build i have and found out it was cyan color when it worked the only problem it was not NDB7675 the front window is huge compare to the original diode i believe the selling new diodes or just copy diodes or maybe completely different 462nm diode 9mm