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Laser power meter

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Hey all. I have a need to build a cheap laser power meter, specifically, what I need is to test the output of a red laser at 650nm @ approx .80mW. I don't need anything fancy but it should be fairly accurate.

I've been reading over the info at http://www.repairfaq.org/sam/laserioi.htm#ioilpm3 and have a good idea that I could build one to suit but am not sure where to start. I have a 'decent' background in electronics and could build this easily on my own if given a little push. I have a good DMM and an old but trustworthy analog scope.

If someone could give me a hand I'd appreciate it. TIA

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