You're going to need a powerful laser; if only to avoid a long wait after pulling the trigger. Primers are reflective, and the brass shell casing and steel chamber are both good conductors of heat.Im more just interested in trying it than anythingCould you set off a primer with a laser? It would be interesting to test out what the smallest laser that could do it is. I have a few ideas now...
Then there's the issue of protecting the optics and laser diode from everything subsequent to the primer being ignited.