I don't know what you have planned, by as I said, if I were you, I'd make two different type of lasers - continous and pulse.
Continous fires a long-lasting single beam (what current lasers should IMHO be). It has no "burst" secondary mode, but either a more powerfull beam, or a longer duration beam. If you want to go the extra mile, you can model the fact that a weapon like this practicly can't miss (you can literaly slice the opponent with a beam, there will be contact), but the damage done depends greately on exposure time (accuracy).
Example damage of 40 with a variation of 30 (10-70 damage)
Pulse fires in ultra-short pulses. So either like ye olde laser blasters from SW or Lasgun from Dawn of War.