not trying to steal this thread or anything, so back onto the OP's @edep Yours is pretty cool to have a toggle, maybe try messing around with PCLN +GoL to see if you can get a smaller one.
This is actually the strongest laser with a beam width of 1 pixel. This is because it has a beam that is solid (has no gaps) But since it has no gaps, it is harder to heat, and thus it has to have a big piece of GOL heating it making it a very big laser.
These took a long time of trial and error, so I hope you like them