Illuana is correct.
Personally I research two weapons as the Ai does adapt and will counter you. By having two main weapon types you will slow down his ability to counter you. Lasers while weak on paper fire fairly well, have excellent accuracy and are mid range weapons.
Also interceptors do use them. In fact I think all carrier based drones/fighter use beams unless Paul changed the default load outs.
I primarily focus on Missiles and also keep beams up to the at least the same tier as the missiles I have Disrupters with Sparrow? ( the one after stingers). I usually also grab the techs that improve both accuracy and rate of fire for missiles.
My biggest question for developers reading this thread is this:
Do the accuracy modules for specific weapons techs (increased missile accuracy) stack with the targeting modules you get in the sensor lines? Also....Do the two targeting sensor techs one is earlier stack with each other, meaning is it 'best' to have both modules on the same ship to 'double up' on weapon accuracy? Same question applies to jamming.