I wasn't thinking laser, more like brass tips for a soldering iron. I have a few that screw into a tip of the soldering iron. The burn depth depends on the pressure you use. Here's one I did on a pair of wooden scales. http://i1255.photobucket.com/albums/hh627/enki_ck/SAK/P7180041.jpgSorry to hijack the thread a bit but I thought you might like the idea.