Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

Buy Site Supporter Role (remove some ads) | LPF Donations

Links below open in new window

FrozenGate by Avery

Diodes Compilation - All Diodes Data In One Thread!

I think at this point we need to include the data on most used Diodes (12x from lite on, 445nm A130 A140, etc) and put in the experimentally obtained data confirmed in at least 2 or 3 applications. If you will wait until official data becomes available from manufacturer this will stay the way it is now forever! It is too conservative!

Besides you can always go back and correct the values when better experimental data is available.
 





canpower said:
I don't know if there is a rule of thumb or not when determining pinout or voltages or even current ratings for that matter for laser diodes, I just don't want to unnessesarily FRY any of my diodes if I can avoid it, and of course would like to know ahead of time what the power output of adiode is so I don't waste my time trying to get a big output from a 5mw diode, thinking it might be a 1 watt diode or something!

I hope someone out there can steer me in the right direction!
Thanks!

;)
Click to expand...

I just use my digital multimeter's lowest resistance scale. Diodes, by deffinition, only conduct in one polarity, so some combination will have continuity of a couple of ohms or so, and the wrong ones will show open. It has a diode testin mode, too, but I don't know how that would work for a laser diode, the good old continuity test works for me. The only thing is that you have to probe all three pins to one another, in both polarities till you find the combination that has low resistance continuity (not a dead short, either). I have a driver I made out of an LM317 with a linear pot to regulate it's output. I connect to that, once I have the pins figured out, and gradually turn it up until it reaches the lasing threshoid. I can also then check the resistance across my pot, to calculate the output of the LM317, to get a ballpark figure of how much juice it draws.
That might not be the right way, but it works for me with what I have, and what I know, and it doesn't fry diodes. Here is a link to the LM317 diagram and calculator, the current control one (only one resistor, not two) is the same as every basic LM317 driver diagram, and the resistor value/output current calculator is very handy.
http://diyaudioprojects.com/Technical/Voltage-Regulator/
 
Last edited:
You're digging up a year old thread to reply to a 2 year old post 2 pages back AND you give advice that blows up diodes!
NEVER connect a multimeter in ohm or diode mode to a diode! The reverse voltage it may give can kill a diode and you may discharge a cap though the diode in forward mode, so this is a method that is likely to kill diodes. Some diodes also have a photodiode to monitor the output which you also need to take into account.
Please be carefull when giving advice, others may follow it.
 
For diodes without photodiode I use my dmm to find the right polarity, but I use the diode-tester mode. I know my meter is limited to 3v and 2mA. The meter is a cheap UNI-T UT33D. It is actually limited to the same values in resistance-mode too, but then it does, as Bluefan mention, use a cap to stabelize the values.
(I could not find a cap in the diode path though.)

It barely makes my red diodes glow dimly, and it's definately too low for lasing.

Bluefan has a good point regarding photodiodes though, as they do conduct and appear remarkably like LD's on this simple reading.

Another issue is the IR LD's in some dual packages. They seem to have a lower Vf than the RED ones but I mostly identify em by the tiny red glow from the "right" one.
 
Bluefan said:
You're digging up a year old thread to reply to a 2 year old post 2 pages back AND you give advice that blows up diodes!
Click to expand...

Someone needs to update the OP, or better yet, make a new one. This bad boy is getting long in the tooth! :D (<-- just noticed that the smiley has pretty long teeth :crackup:)
 
Last edited:
Lite-ON 50HW-16935 DVD-RW:

Wavelengt: RED
Power: ?
Lasing threshold: Approx 60 mA
Vf at lasing threshold: 2.16 V

Attached is a graph I did with diode in aixis module, fitted in 40x40x20mm cooling block with temperature-control at ambient-8°C (approx 20°C).
I didn't dare go much higher but may do so later.

My power-meter is uncalibrated so only relative measurements possible.
(Direct mV readings from a 15x15mm TEC painted matte black with forced convection sink on the back.)
 

Attachments

  • lite-on_sohw-16935_ifv-graph.png
    lite-on_sohw-16935_ifv-graph.png
    27 KB · Views: 895
This thread could almost stand to be unstickied. It is not updated at all and much of the data is fading into history...
 
Anyone have info on the GGW-H20L Diode?
The 405nm not the 650. Thanks
Matt
 
Last edited:
I know this thread is old and surely that's why it's not included, but I feel like data on the PHR 805t should be included...especially considering it is replacing the PHR 803t and has a different pinout...it also seems to be many peoples first build but lots of confusion about it
 
TheDudeMakesLasers said:
I know this thread is old and surely that's why it's not included, but I feel like data on the PHR 805t should be included...especially considering it is replacing the PHR 803t and has a different pinout...it also seems to be many peoples first build but lots of confusion about it
Click to expand...

Used the search and this was the first hit this should be EVERYthing you need to mount that diode. http://laserpointerforums.com/f50/phr-803t-red-ir-diode-pinout-currents-36212.html
 
I will risk sounding like a broken record but, I have proposed in another thread that we could create a publicly editable documents (google docs) with build summaries and diode information (specs, current, voltage, output etc)

http://laserpointerforums.com/f44/diodes-specs-build-compilation-threads-77027.html

Anyone would be able to edit the info in them. In addition there are backups available in case some one messes the content up.
 
Last edited:
jander6442 said:
Used the search and this was the first hit this should be EVERYthing you need to mount that diode. http://laserpointerforums.com/f50/phr-803t-red-ir-diode-pinout-currents-36212.html
Click to expand...

Forgive me in I'm a complete noob but I'm pretty sure that thread has nothing to do with a PHR 805t diode...in fact it says 803t right in the thread and shows some funky 4 pin diode which has IR also...

is the PHR 805t brand new or something? Whenever I ask about it I seem to be skirted off by people and sent to info about the PHR 803t...
 
TheDudeMakesLasers said:
Forgive me in I'm a complete noob but I'm pretty sure that thread has nothing to do with a PHR 805t diode...in fact it says 803t right in the thread and shows some funky 4 pin diode which has IR also...

is the PHR 805t brand new or something? Whenever I ask about it I seem to be skirted off by people and sent to info about the PHR 803t...
Click to expand...

No YOUR RIGHT... that's not the intended thread I apologize. Here is the right thread http://laserpointerforums.com/f38/phr-805-405nm-diodes-replace-phr-803ts-62591.html and props to cliff on that. Post #6 is where the meat is on the pin on that diode best I can tell. I'm in and out today sorry for the confusion.:o
 
You must log in or register to reply here.


Back
Top