help with some current/power values

[mrblack927]

Hi all,

Hopefully some of you EE's (or just laser enthusiasts) out there can help me out.

I understand the basics, but how does the amount of current put into a diode correlate to the laser output across different models? That is, if I hook a blu ray diode up to a 50mA driver and then later I swap it out for a red diode, will they have the same mW output? Or are they unrelated?

What I'm trying to do is make the drivers for my RGV projector. The lasers are:
1 532nm DX moldule (rated 50mw)
1 PHR blu ray diode (100mw?)
1 635nm open-can "phazor" diode from a GB on LFP a while ago (200-250mw?)

I have the drivers, I just need to figure out what current to run them at (for a long and healthy lifecycle).

So, does anyone have advice for what I mA values I should use?
Thanks!

[sugeek]

Bunch of useful stuff:
http://www.laserpointerforums.com/fo...num=1217284580

This page has a bunch of graphs you can look at i think you specifically want:
http://img501.imageshack.us/img501/4228/phr803txx6.gif ->803t graph (I am planning on no more than 100mA for mine).

Your red and your 405nm diodes run at different voltages, they also have a different needs for testing each type of diode puts a different load on the driver. If you haven't already you may want to build a dummy load (or shunt) for testing the diode driver, I bade my design on the schematic here (and the other two graphs you need, thanks Dr. Lava):
http://www.laserpointerforums.com/fo...EF_SHEET_1.JPG

If I had built one of those before I plugged in a driver that had just been used for a red diode to a blu-ray, my first blue ray would still output more than 0.5mw...

I hope that helps a bit,
Adam

[mrblack927]

http://www.laserpointerforums.com/fo...EF_SHEET_1.JPG

Wow thanks, that will be really helpful. It looks like that has a plot for the phazor diode too so I should be all set on that.

Another small question; for the test load, isn't it different for each diode? how would I build one that's appropriate for all 3 of my diodes (red a blu people probably know, but what about green?)

Thanks!

[sugeek]

Wow thanks, that will be really helpful. It looks like that has a plot for the phazor diode too so I should be all set on that.

Another small question; for the test load, isn't it different for each diode? how would I build one that's appropriate for all 3 of my diodes (red a blu people probably know, but what about green?)

Thanks!

Yes the test load is different for the red diode, it uses only four inf4001 rectifier diodes, the blue uses six inf4001's. I modified the design to meet my needs by adding a pin (for a test point) at the 4th diode and an output wire for the red, then the same at the 6th diode for testing the blu-ray. I had to use a 5-watt resistor because that is all I could find in stock anywhere (Even fry's was sold out). I made a nicer one after this but I gave it to another PL member.

I am clueless on the green, it is an IR diode and a lower voltage, you may be able to use the red dummy load, but don't take my word on it...

-Adam

[mrblack927]

Thank you Adam, you have been very helpful.

I will be sure to post pictures of my build once I get it up and running!