jedirock
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Ars Technica had a neat writeup about a method the NIST posted on how to see if your green 532nm DPSS laser was outputting any IR. Granted, most people here probably already know how to do this with other methods, but I thought the method was still rather ingenious.
Achtung! Test safety of laser pointers with paper cups, webcam - Ars Technica
Achtung! Test safety of laser pointers with paper cups, webcam - Ars Technica