I'm assuming you're talking about very basic, low power, pointer style lasers. If that's the case, it's time to go into very basic electronics. You're basically replacing the switch in that with some lines connected to your i2c/gpio/whatever. It's not going to be different from turning on an LED. Laser you can program == cheap laser pointer, taken apart, switch replaced.
If you're talking about some bigger devices, then you probably want more interesting electronics and a lot of info about laser safety...
If you're talking about some bigger devices, then you probably want more interesting electronics and a lot of info about laser safety...