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pump diode driver for 200MW green?

icwiz

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Mar 6, 2011
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Hello Everyone,

I recently purchased a 200mw laser from chinavasion. It came DOA. I tried to communicate with them, but basically it was a whole lotta nothing done. Eventually I just bit the bullet and decided to try to fix this myself.

I believe that the driver circuit is blown, and I want to try to make a new one. I have already built a drive for a 200mw red diode, so i got the basics down.

My problem is that I do no have any idea how much power the pump diode takes. I tried to search the forums but I could not find a post were some sort of guide was given to this type of problem.

Is there a way for me to find out? Or is there a method of trial and error that will work here?

Any ideas would be appreciated.

--ICWiz
 





anselm

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Nov 22, 2010
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Hello and welcome!
I have already built a drive for a 200mw red diode, so i got the basics down.
It's not quite the same, while most red's are case negative, green modules are case positive
so you need a driver that regulates on the negative side. A sink instead of a source, in a way.
The LM317 is no good for that, but there are equivalent ICs for negative side regulation,
I don't quite remember it's name just now.

DPSS efficiency can be around 20%, so you'd need around 1W IR for 200mW green.
I'd start around a current of 1/2A and carefully get more adventurous.

Good luck man!
 

icwiz

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Joined
Mar 6, 2011
Messages
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Hello and welcome!

It's not quite the same, while most red's are case negative, green modules are case positive
so you need a driver that regulates on the negative side. A sink instead of a source, in a way.
The LM317 is no good for that, but there are equivalent ICs for negative side regulation,
I don't quite remember it's name just now.

DPSS efficiency can be around 20%, so you'd need around 1W IR for 200mW green.
I'd start around a current of 1/2A and carefully get more adventurous.

Good luck man!

Aaah Thanks a lot! That is very helpful. I had seen negative regulators when i was looking into how to use the LM317. I didnt understand what that meant, but now its making sense.

If the Diode is blown, then I guess i might have to try to actually pull it out, but im hoping it was just the driver.

I'll post back if I manage to get it working :)

Thanks again!

--ICWiz
 
Joined
Aug 15, 2009
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The voltage across the diode or the voltage for the driver? The voltage across the diode is roughly 2.2V, the voltage for the driver wil depend on the type of driver.
 




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