# Calculating the average power emitted from a laser

1. Jun 17, 2010

### toughsteel

I have found a 5000 volt 20 milliamp laser at a Ham fest now logic tells me the power of the laser would be simply 5000V*0.02A= 10watt input then loses would maybe make it one watt. however I really doubt that it has that much power. I haven't been able to find a power supply capable either of running the thing either because the ignition voltage is 10,000 volts! I would rather find out the power of the Laser before I go on a hunt for a power supply and I'm curious on how one can calculate the power of a laser without measuring the output beam intensity.

Last edited: Jun 17, 2010
2. Jun 17, 2010

### kuruman

If you have a 20 milliWatt laser, isn't its power 20 milliWatts or am I missing something?

3. Jun 17, 2010

### toughsteel

no the rating on the side says 20 milli amps 5000 volts

4. Jun 17, 2010

### kuruman

5. Jun 17, 2010

### toughsteel

I see that its what I thought, a measuring device however would be very expensive. I think however if I compare it to the efficiency of other lasers I end up with a very small rating around 50 milliwatts. The irony is that the thing is about 16 inches long and has a 2 inch diameter yet most likely has a rating only a few times greater than your average laser pointer. I guess they don't scale well. (Note by efficiency of other lasers I mean watts in watts out)