Just slightly off topic but a lot of lasers use high voltage power supplies and you can be exposed to lethal conditions If you don't know what you're doing.
I've sold a lot of high voltage components to many experimenters, pros and Engineers who like to tinker with sparks and arcs.
One of those Engineers is Bert Hickman, now retired but still active.
Checkout a section of his web site at
" http://205.243.100.155/frames/longarc.htm#Blowup " for eye opening incidents and effects of high voltage.
Rick :-)