532 pump diode current

[polishedball]

Is there a basic efficiency calculation to determine pump diode current of a 532 head? I know measure it but I haven't the unit in front of me and am trying to determine a couple of things.

For 150mw 532 is a 1W/1amp pump diode is used in most cases iirc.

What would a 300mw us for a pump diode and current?

Thanks for any info.

[steve-o]

I think the basic rule of thumb is 10:1. 300mw of green would require a 3W pump diode. I could be wrong :]
-edit- oops you said current not power.. n/m ..

[Solonar]

My 75mW green is being pumped at 1.8V @ 450mA

[steve-o]

My 150mw'ers draw a little over 600mA. They don't quite output 150mw at that current, more like 120mw. (they're the o-like 12mm small round modules)

[Badpip]

I have two 300mW rated lasever heads. Both do around 450mW.

Current draw is 3A at 5V. This includes the TEC, so I guess the pump diode is around 2A/2W

/Thomas

[Xytrell]

^COP of a TEC is something like 0.5, so you need about twice the power of whatever you're cooling to keep it in equilibrium. In my experience, output is generally around 25% of the pump power.

[Badpip]

^COP of a TEC is something like 0.5, so you need about twice the power of whatever you're cooling to keep it in equilibrium. In my experience, output is generally around 25% of the pump power.

That matches my result well. 2W 808 at 2A would consume 4W if the Vdrop is 2V.

2 watt is light, and 2 watt is heat. Twice the power for the TEC is 4W. At 5V this is 0.8A. Total will then be 2.8A - pretty close to the 3A I measured

/Thomas