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FrozenGate by Avery

Help identifying and powering diodes

Ramsey_innovations

Ramsey_innovations

0
Joined
May 10, 2009
Messages
379
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Hi all, I found these diodes at a surplus store and I don't know too much about them other than the box they were in was labeled 904nm 8w pulsed. At first I didn't even realize there were two different diodes until I looked closely under an eye loop. These diodes appear to be pulled from some sort of an array as they are all numbered sequentially on the back and side with a sharpie.

5678-mysterydiode2.jpg


5679-mysterydiode4.jpg


5680-mysterydiode5.jpg


5681-mysterydiode6.jpg


So, how can I power these to test them? I bought a couple 555 timers in hopes that I could use them to setup a pulsed driver, but I've never done that and haven't been able to find very much info about it via the search button. Any help would be greatly appreciated. :thanks:
 





Cyparagon, thanks for the link.

I happened to be near the place I picked up these diodes from, so I stopped by and asked if they had any info on them. All they could provide me with was the lable on the box so I snapped a pic.

5682-mysterydiode7.jpg


I know these aren't exactly high output diodes but I'd like to get them functioning. I'm guessing they were used in ranging.
 
They are IR so you need a variable amperage power source that can provide 1-3V and then just start low like 100mA and start to increase from there with the diode in a good heatsink. At each currently level plot the powerVScurrent on an xy graph. Output power on left current on bottom. Then as you go look for where the graph starts to level off and usually thats where a true max output will be. Sometimes it will not level off and you may over power the diodes and destroy them. But if you have several and no spec sheet that may just be what you have to do. If the first one blows at 1000mA then set the second one to 6-800mA.
 
piferal said:
This one maybe is not the same, but could be similarly.

This model in particular that I give, usually works at 50ns, 1 kHz.

Anyway here you have the technical data in PDF format to give you an idea.

http://www.roithner-laser.com/previous/All_Datasheets/Laserdiodes/PLD904-8-T.pdf

And for the driver look here, in the section "Pulsed Laser Diode Drivers" maybe can help a little.

Sam's Laser FAQ - Diode Laser Power Supplies

I hope to be helpful
Click to expand...

Very helpful indeed, thank you! I should have known to check Sam'a FAQ:banghead: However, I'm not sure where I'm going to get a 200VDC power supply:thinking: Anyway, thanks again +1 rep!

Helios said:
They are IR so you need a variable amperage power source that can provide 1-3V and then just start low like 100mA and start to increase from there with the diode in a good heatsink. At each currently level plot the powerVScurrent on an xy graph. Output power on left current on bottom. Then as you go look for where the graph starts to level off and usually thats where a true max output will be. Sometimes it will not level off and you may over power the diodes and destroy them. But if you have several and no spec sheet that may just be what you have to do. If the first one blows at 1000mA then set the second one to 6-800mA.
Click to expand...

Thank you for the suggestion. I unfortunately do not have an LPM yet (I know, it's a long over due investment) and with the driver being pulsed I'm not sure how much data I can accurately record without having more sophisticated equipment. I will however attempt to get this one of these diodes going and I'll be sure to post back with any info. Thanks for the help!
 
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