What you can do is basically use partially overlapping beams to energize an area smaller than any of the individual beams (think venn diagram). Its a similar te

What you can do is basically use partially overlapping beams to energize an area smaller than any of the individual beams (think venn diagram). Its a similar technique (except in 2 dimensions) to radiation therapy where multiple beams of radiation are passed through healthy tissue such that their intersection point is on cancerous tissue. That way only the cancerous tissue receives a highly damaging dose of radiation while the healthy tissue receives significantly lesser dosages.