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Hmmm I am going to look into active current regulation. This would help prevent a chain reaction of diodes burning out right?

This article sums it up nicely: Some time ago, this very question was posted to an Internet laser discussion group in response to the assertion that light emitting diodes (LEDs) and other light sources might work as well in the clinic.  This topic was raised again in the June issue of...

Awesome.  You are right that is a huge amount of energy being lost with the diodes we are using. It would probably be lost as heat as well no? What extent of regulation should I be looking for in a spec sheet for a power supply?  I heard there is sometimes a small voltage spike when a power...

Sorry, forgot about the voltage drop. So with the circuit I posted earlier I could use an unregulated 12V power supply and not worry? Or I could just use an ATX style regulated (switching) supply and just use some current limiting resistors attached to each diode?

Thanks for the input Andy. I think I would need modulation and I kind of like the fact that it will remove the extra charge from the capacitor. Please correct me if I am wrong but this would basically allow me to run my device even if a diode burns out. I realize this circuit looks like...

Ok I have been looking around and happened to stumble upon a site that discusses driving multiple diodes.  Here is what the guys says on the subject: "There are probably other ways to do this but this is one way that works. The laser diodes can NOT simply be hooked in parallel as the diode with...

Wow guys thanks for all the input. Charlie that was kind of what I was thinking about doing. Right now I am using a modified ATX style power supply which can give me access to a lot of different voltages at a pretty high amperage. I was crunching some numbers to see how many diodes I would be...

While in theory it should work just the same... all of the testing was done with this distance and this power output. The design we are using keeps the lasers close to the skin as to minimize power loss. I remember reading somewhere that diffused diodes lose there ability to bio-stimulate at...

The problem with using these in this application is that there is a "sweet spot" so to speak in terms of exposure. In this case more is not always better. The bio-stimulation range for tissue/cells is 4-6 joules/cm^2; around 10 j/cm^2 you will get no benefits; and around 16+ j/cm^2 you will...

Bizarre yes... I can agree with that. If you must know ;) it is for the creation of a home use therapeutic laser device. Lasers are at the cutting edge of healthcare these days and there is plenty of research that has been done on their uses. Different wavelengths are used for different...

Hey guys, I hope this isn't too crazy to ask but this seems to be the place to ask it.  I have already learned quite a bit from sifting through the site for the last day or two and the depth of topics discussed here is great.  I have been going through the threads and searching the site but...